\[ \sin (x) y'(x)+y(x)^2 \left (-\sin ^2(x)\right )+y(x) (\cos (x)-3 \sin (x))+4=0 \] ✓ Mathematica : cpu = 0.0591586 (sec), leaf count = 24
\[\left \{\left \{y(x)\to \left (\frac {1}{c_1 e^{5 x}+\frac {1}{5}}-4\right ) \csc (x)\right \}\right \}\]
✓ Maple : cpu = 0.124 (sec), leaf count = 28
\[ \left \{ y \left ( x \right ) ={\frac {-4\, \left ( {{\rm e}^{x}} \right ) ^{5}{\it \_C1}-4}{\sin \left ( x \right ) \left ( \left ( {{\rm e}^{x}} \right ) ^{5}{\it \_C1}-4 \right ) }} \right \} \]