Verified answer

task/30397800                невозможно        ))

∫ x²cos(x³+11)dx=∫(1/3)*cos(x³+11)d(x³+11) =(1/3)∫cos(x³+11)d(x³+11) =

=(1/3)sin(x³+11) +С     * * * d(x³+11) =(x³+11)'dx=3x²dx и ∫costdt =sint * * *