Question

int {[sinˆ2(x)]/[sin^4(x)+1]}*sin(2x)dx

Answer 1

???

Answer 2

sin(2x) = 2sinx cosx

\[= 2\int\limits_{}^{}\frac{\sin^{3} x \cos x}{\sin^{4} x +1}\]
then use substitution
u = sin^4
du = 4sin^3 cos

Answer 3

thank you so much

Answer 4

no problem:)