1.

2(ii) fa

Answer»

∫x^2 dx /(1 + x^6)

let x^3 = u3 x^2 dx = dux^2 dx = (1/3) du

1/3∫ du /(1 + u^2)

= (1/3)tan^-1(u) + C

= (1/3)tan^-1(x^3) + C


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