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ay(x)(ddxy(x))2+1−2xy(x)ddxy(x)+(y(x))2−x2=0
Mathematica: cpu = 21.646749 (sec), leaf count = 110 {{y(x)→−a2c12(−x2)−4a2c1x−4a2+4x2a2c12−4},{y(x)→a2c12(−x2)−4a2c1x−4a2+4x2a2c12−4}}
Maple: cpu = 0.671 (sec), leaf count = 1512 {∫_bx1(2_a3−2_a(y(x))2+a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4))(−2a2_a(y(x))2+2_a5+4_a3(y(x))2+2(y(x))4_a+_a2a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4)−(y(x))2a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4))−1d_a+∫y(x)−(a2−4x2)_f(−2a2x_f2+2x5+4x3_f2+2x_f4+x2−a2(−_f4+_f2a2−2_f2x2−x4)−_f2−a2(−_f4+_f2a2−2_f2x2−x4))−1−∫_bx1(−4_f_a−a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2))(−2a2_a_f2+2_a5+4_a3_f2+2_f4_a+_a2a2(_a4+2_a2_f2+_f4−_f2a2)−_f2a2(_a4+2_a2_f2+_f4−_f2a2))−1−1(2_a3−2_a_f2+a2(_a4+2_a2_f2+_f4−_f2a2))(−4a2_a_f+8_a3_f+8_a_f3−_a2a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2)−2_fa2(_a4+2_a2_f2+_f4−_f2a2)+_f2a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2))(−2a2_a_f2+2_a5+4_a3_f2+2_f4_a+_a2a2(_a4+2_a2_f2+_f4−_f2a2)−_f2a2(_a4+2_a2_f2+_f4−_f2a2))−2d_ad_f+_C1=0,∫_bx1(2_a(y(x))2−2_a3+a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4))(2a2_a(y(x))2−2_a5−4_a3(y(x))2−2(y(x))4_a+_a2a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4)−(y(x))2a2(_a4+2_a2(y(x))2−a2(y(x))2+(y(x))4))−1d_a+∫y(x)(a2−4x2)_f(2a2x_f2−2x5−4x3_f2−2x_f4+x2−a2(−_f4+_f2a2−2_f2x2−x4)−_f2−a2(−_f4+_f2a2−2_f2x2−x4))−1−∫_bx−1(2_a_f2−2_a3+a2(_a4+2_a2_f2+_f4−_f2a2))(4a2_a_f−8_a3_f−8_a_f3−_a2a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2)−2_fa2(_a4+2_a2_f2+_f4−_f2a2)+_f2a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2))(2a2_a_f2−2_a5−4_a3_f2−2_f4_a+_a2a2(_a4+2_a2_f2+_f4−_f2a2)−_f2a2(_a4+2_a2_f2+_f4−_f2a2))−2+1(4_f_a−a2(−4_a2_f−4_f3+2_fa2)21a2(_a4+2_a2_f2+_f4−_f2a2))(2a2_a_f2−2_a5−4_a3_f2−2_f4_a+_a2a2(_a4+2_a2_f2+_f4−_f2a2)−_f2a2(_a4+2_a2_f2+_f4−_f2a2))−1d_ad_f+_C1=0}
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