Added April 13, 2019.
Problem Chapter 5.7.4.1, from Handbook of first order partial differential equations by Polyanin, Zaitsev, Moussiaux.
Solve for \(w(x,y)\)
\[ a w_x + b w_y = w + c_1 \arccot ^k(\lambda x) + c_2 \arccot ^n(\beta y) \]
Mathematica ✓
ClearAll["Global`*"]; pde = a*D[w[x, y], x] + b*D[w[x, y], y] == w[x,y]+ c1*ArcCot[lambda*x]^k+c2*ArcCot[beta*y]^n; sol = AbsoluteTiming[TimeConstrained[DSolve[pde, w[x, y], {x, y}], 60*10]];
\[\left \{\left \{w(x,y)\to e^{\frac {x}{a}} \left (\int _1^x\frac {e^{-\frac {K[1]}{a}} \left (\text {c1} \cot ^{-1}(\lambda K[1])^k+\text {c2} \cot ^{-1}\left (\beta \left (y+\frac {b (K[1]-x)}{a}\right )\right )^n\right )}{a}dK[1]+c_1\left (y-\frac {b x}{a}\right )\right )\right \}\right \}\]
Maple ✓
restart; pde := a*diff(w(x,y),x)+ b*diff(w(x,y),y) = w(x,y)+c1*arccot(lambda*x)^k+c2*arccot(beta*y)^n; cpu_time := timelimit(60*10,CodeTools[Usage](assign('sol',pdsolve(pde,w(x,y))),output='realtime'));
\[w \left ( x,y \right ) = \left ( \int ^{x}\!{\frac {1}{a}{{\rm e}^{-{\frac {{\it \_a}}{a}}}} \left ( {\it c1}\, \left ( {\frac {\pi }{2}}-\arctan \left ( {\it \_a}\,\lambda \right ) \right ) ^{k}+{\it c2}\, \left ( {\frac {\pi }{2}}-\arctan \left ( {\frac {\beta \, \left ( ay-b \left ( x-{\it \_a} \right ) \right ) }{a}} \right ) \right ) ^{n} \right ) }{d{\it \_a}}+{\it \_F1} \left ( {\frac {ay-xb}{a}} \right ) \right ) {{\rm e}^{{\frac {x}{a}}}}\]
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Added April 13, 2019.
Problem Chapter 5.7.4.2, from Handbook of first order partial differential equations by Polyanin, Zaitsev, Moussiaux.
Solve for \(w(x,y)\)
\[ a w_x + b w_y = c w + \arccot ^k(\lambda x) \arccot ^n(\beta y) \]
Mathematica ✓
ClearAll["Global`*"]; pde = a*D[w[x, y], x] + b*D[w[x, y], y] == c*w[x,y]+ ArcCot[lambda*x]^k*ArcCot[beta*y]^n; sol = AbsoluteTiming[TimeConstrained[DSolve[pde, w[x, y], {x, y}], 60*10]];
\[\left \{\left \{w(x,y)\to e^{\frac {c x}{a}} \left (\int _1^x\frac {e^{-\frac {c K[1]}{a}} \cot ^{-1}(\lambda K[1])^k \cot ^{-1}\left (\beta \left (y+\frac {b (K[1]-x)}{a}\right )\right )^n}{a}dK[1]+c_1\left (y-\frac {b x}{a}\right )\right )\right \}\right \}\]
Maple ✓
restart; pde := a*diff(w(x,y),x)+ b*diff(w(x,y),y) = c*w(x,y)+ arccot(lambda*x)^k*arccot(beta*y)^n; cpu_time := timelimit(60*10,CodeTools[Usage](assign('sol',pdsolve(pde,w(x,y))),output='realtime'));
\[w \left ( x,y \right ) = \left ( \int ^{x}\!{\frac {1}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( {\it \_a}\,\lambda \right ) \right ) ^{k} \left ( {\frac {\pi }{2}}-\arctan \left ( {\frac {\beta \, \left ( ay-b \left ( x-{\it \_a} \right ) \right ) }{a}} \right ) \right ) ^{n}{{\rm e}^{-{\frac {c{\it \_a}}{a}}}}}{d{\it \_a}}+{\it \_F1} \left ( {\frac {ay-xb}{a}} \right ) \right ) {{\rm e}^{{\frac {cx}{a}}}}\]
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Added April 13, 2019.
Problem Chapter 5.7.4.3, from Handbook of first order partial differential equations by Polyanin, Zaitsev, Moussiaux.
Solve for \(w(x,y)\)
\[ a w_x + b w_y = \left ( c_1 \arccot (\lambda _1 x) + c_2 \arccot (\lambda _2 y)\right ) w+ s_1 \arccot ^n(\beta _1 x)+ s_2 \arccot ^k(\beta _2 y) \]
Mathematica ✓
ClearAll["Global`*"]; pde = a*D[w[x, y], x] + b*D[w[x, y], y] == ( c1*ArcCot[lambda1*x] + c2*ArcCot[lambda2*y])*w[x,y]+ s1*ArcCot[beta1*x]^n+ s2*ArcCot[beta2*y]^k; sol = AbsoluteTiming[TimeConstrained[DSolve[pde, w[x, y], {x, y}], 60*10]];
\[\left \{\left \{w(x,y)\to \left (\text {lambda1}^2 x^2+1\right )^{\frac {\text {c1}}{2 a \text {lambda1}}} \exp \left (\frac {\frac {\text {c2} \left (a \log \left (a^2 \left (\text {lambda2}^2 y^2+1\right )\right )+2 \text {lambda2} \tan ^{-1}(\text {lambda2} y) (b x-a y)+2 b \text {lambda2} x \cot ^{-1}(\text {lambda2} y)\right )}{b \text {lambda2}}+2 \text {c1} x \cot ^{-1}(\text {lambda1} x)}{2 a}\right ) \left (\int _1^x\frac {\exp \left (-\frac {\text {c2} (b x-a y) \tan ^{-1}\left (\text {lambda2} \left (y+\frac {b (K[1]-x)}{a}\right )\right )+b \left (\text {c1} \cot ^{-1}(\text {lambda1} K[1])+\text {c2} \cot ^{-1}\left (\text {lambda2} \left (y+\frac {b (K[1]-x)}{a}\right )\right )\right ) K[1]}{a b}\right ) \left (\text {s2} \cot ^{-1}\left (\text {beta2} \left (y+\frac {b (K[1]-x)}{a}\right )\right )^k+\text {s1} \cot ^{-1}(\text {beta1} K[1])^n\right ) \left (\text {lambda1}^2 K[1]^2+1\right )^{-\frac {\text {c1}}{2 a \text {lambda1}}} \left (\left (\text {lambda2}^2 y^2+1\right ) a^2+2 b \text {lambda2}^2 y (K[1]-x) a+b^2 \text {lambda2}^2 (x-K[1])^2\right )^{-\frac {\text {c2}}{2 b \text {lambda2}}}}{a}dK[1]+c_1\left (y-\frac {b x}{a}\right )\right )\right \}\right \}\]
Maple ✓
restart; pde := a*diff(w(x,y),x)+ b*diff(w(x,y),y) = ( c1*arccot(lambda1*x) + c2*arccot(lambda2*y))*w(x,y)+ s1*arccot(beta1*x)^n+ s2*arccot(beta2*y)^k; cpu_time := timelimit(60*10,CodeTools[Usage](assign('sol',pdsolve(pde,w(x,y))),output='realtime'));
\[w \left ( x,y \right ) = \left ( \int ^{x}\!{\frac {1}{a}{{\rm e}^{{\frac {1}{2\,ba} \left ( 2\, \left ( \left ( -x+{\it \_a} \right ) b+ay \right ) {\it c2}\,\arctan \left ( {\frac {\lambda 2\, \left ( ay-b \left ( x-{\it \_a} \right ) \right ) }{a}} \right ) +2\,{\it \_a}\,b \left ( \arctan \left ( \lambda 1\,{\it \_a} \right ) {\it c1}-1/2\,\pi \, \left ( {\it c1}+{\it c2} \right ) \right ) \right ) }}} \left ( {\frac { \left ( ay-b \left ( x-{\it \_a} \right ) \right ) ^{2}{\lambda 2}^{2}+{a}^{2}}{{a}^{2}}} \right ) ^{-{\frac {{\it c2}}{2\,b\lambda 2}}} \left ( {{\it \_a}}^{2}{\lambda 1}^{2}+1 \right ) ^{-{\frac {{\it c1}}{2\,a\lambda 1}}} \left ( {\it s1}\, \left ( {\frac {\pi }{2}}-\arctan \left ( \beta 1\,{\it \_a} \right ) \right ) ^{n}+{\it s2}\, \left ( {\frac {\pi }{2}}-\arctan \left ( {\frac {\beta 2\, \left ( ay-b \left ( x-{\it \_a} \right ) \right ) }{a}} \right ) \right ) ^{k} \right ) }{d{\it \_a}}+{\it \_F1} \left ( {\frac {ay-xb}{a}} \right ) \right ) \left ( {\lambda 1}^{2}{x}^{2}+1 \right ) ^{{\frac {{\it c1}}{2\,a\lambda 1}}} \left ( {\lambda 2}^{2}{y}^{2}+1 \right ) ^{{\frac {{\it c2}}{2\,b\lambda 2}}}{{\rm e}^{{\frac {1}{2\,ba} \left ( -2\,a\arctan \left ( \lambda 2\,y \right ) y{\it c2}-2\,bx \left ( {\it c1}\,\arctan \left ( \lambda 1\,x \right ) -1/2\,\pi \, \left ( {\it c1}+{\it c2} \right ) \right ) \right ) }}}\]
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Added April 13, 2019.
Problem Chapter 5.7.4.4, from Handbook of first order partial differential equations by Polyanin, Zaitsev, Moussiaux.
Solve for \(w(x,y)\)
\[ a w_x + b \arccot ^m(\mu x) w_y = c \arccot ^k(\nu x) w + p \arccot ^n(\beta y) \]
Mathematica ✓
ClearAll["Global`*"]; pde = a*D[w[x, y], x] + b*ArcCot[mu*x]^m*D[w[x, y], y] == c*ArcCot[nu*x]^k*w[x,y]+p*ArcCot[beta*y]^n; sol = AbsoluteTiming[TimeConstrained[DSolve[pde, w[x, y], {x, y}], 60*10]];
\[\left \{\left \{w(x,y)\to \exp \left (\int _1^x\frac {c \cot ^{-1}(\nu K[2])^k}{a}dK[2]\right ) \left (\int _1^x\frac {\exp \left (-\int _1^{K[3]}\frac {c \cot ^{-1}(\nu K[2])^k}{a}dK[2]\right ) p \cot ^{-1}\left (\beta \left (y-\int _1^x\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]+\int _1^{K[3]}\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]\right )\right ){}^n}{a}dK[3]+c_1\left (y-\int _1^x\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]\right )\right )\right \}\right \}\]
Maple ✓
restart; pde := a*diff(w(x,y),x)+ b*arccot(mu*x)^m*diff(w(x,y),y) = c*arccot(nu*x)^k*w(x,y)+p*arccot(beta*y)^n; cpu_time := timelimit(60*10,CodeTools[Usage](assign('sol',pdsolve(pde,w(x,y))),output='realtime'));
\[w \left ( x,y \right ) = \left ( \int ^{x}\!{\frac {p}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( {\frac {\beta }{a} \left ( b\int \! \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,{\it \_f} \right ) \right ) ^{m}\,{\rm d}{\it \_f}+ \left ( -\int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,x \right ) \right ) ^{m}}\,{\rm d}x+y \right ) a \right ) } \right ) \right ) ^{n}{{\rm e}^{-{\frac {c}{a}\int \! \left ( {\frac {\pi }{2}}-\arctan \left ( \nu \,{\it \_f} \right ) \right ) ^{k}\,{\rm d}{\it \_f}}}}}{d{\it \_f}}+{\it \_F1} \left ( -\int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,x \right ) \right ) ^{m}}\,{\rm d}x+y \right ) \right ) {{\rm e}^{\int \!{\frac {c}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \nu \,x \right ) \right ) ^{k}}\,{\rm d}x}}\]
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Added April 13, 2019.
Problem Chapter 5.7.4.5, from Handbook of first order partial differential equations by Polyanin, Zaitsev, Moussiaux.
Solve for \(w(x,y)\)
\[ a w_x + b \arccot ^m(\mu x) w_y = c \arccot ^k(\nu y) w + p \arccot ^n(\beta x) \]
Mathematica ✓
ClearAll["Global`*"]; pde = a*D[w[x, y], x] + b*ArcCot[mu*x]^m*D[w[x, y], y] == c*ArcCot[nu*y]^k*w[x,y]+p*ArcCot[beta*x]^n; sol = AbsoluteTiming[TimeConstrained[DSolve[pde, w[x, y], {x, y}], 60*10]];
\[\left \{\left \{w(x,y)\to \exp \left (\int _1^x\frac {c \cot ^{-1}\left (\nu \left (y-\int _1^x\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]+\int _1^{K[2]}\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]\right )\right ){}^k}{a}dK[2]\right ) \left (\int _1^x\frac {\exp \left (-\int _1^{K[3]}\frac {c \cot ^{-1}\left (\nu \left (y-\int _1^x\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]+\int _1^{K[2]}\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]\right )\right ){}^k}{a}dK[2]\right ) p \cot ^{-1}(\beta K[3])^n}{a}dK[3]+c_1\left (y-\int _1^x\frac {b \cot ^{-1}(\mu K[1])^m}{a}dK[1]\right )\right )\right \}\right \}\]
Maple ✓
restart; pde := a*diff(w(x,y),x)+ b*arccot(mu*x)^m*diff(w(x,y),y) = c*arccot(nu*y)^k*w(x,y)+p*arccot(beta*x)^n; cpu_time := timelimit(60*10,CodeTools[Usage](assign('sol',pdsolve(pde,w(x,y))),output='realtime'));
\[w \left ( x,y \right ) = \left ( \int ^{x}\!{\frac {p}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \beta \,{\it \_f} \right ) \right ) ^{n}{{\rm e}^{-{\frac {c}{a}\int \! \left ( {\frac {\pi }{2}}-\arctan \left ( {\frac {\nu }{a} \left ( b\int \! \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,{\it \_f} \right ) \right ) ^{m}\,{\rm d}{\it \_f}+ \left ( -\int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,x \right ) \right ) ^{m}}\,{\rm d}x+y \right ) a \right ) } \right ) \right ) ^{k}\,{\rm d}{\it \_f}}}}}{d{\it \_f}}+{\it \_F1} \left ( -\int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,x \right ) \right ) ^{m}}\,{\rm d}x+y \right ) \right ) {{\rm e}^{\int ^{x}\!{\frac {c}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \nu \, \left ( \int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,{\it \_b} \right ) \right ) ^{m}}\,{\rm d}{\it \_b}-\int \!{\frac {b}{a} \left ( {\frac {\pi }{2}}-\arctan \left ( \mu \,x \right ) \right ) ^{m}}\,{\rm d}x+y \right ) \right ) \right ) ^{k}}{d{\it \_b}}}}\]
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