`int_-a^a(1+x^3)^(-1)dx=` (A) `0` (B) `2int_0^a(1-x^6)^(-1)dx` (C) `2int_0^a(1+x^3)^(-1)dx` (D) `2int_0^a[1+(a-x^3)]^(-1)dx`

int_-1^1 (sinx+x^2)/(3-|x|)dx= (A) 0 (B) 2int_0^1 sinx/(3-|x|)dx (C) 2int_0^1 x^2/(3-|x|)dx (D) 2int_0^1 (sinx+x^2)/(3-|x|)dx

int_(0)^(3)(x^(2)+1)dx

int_(1)^(2) (x^3+1) dx

int_0^1(2-3x+x^2)dx

int_0^1 (x/(x+1))dx

int_(0)^(1)x^2dx

int_(0)^(1) x dx

int_(0)^(1)(dx)/(1+x)

(3) (a) int_(0)^(2)(x^(4)+1)dx

1. int_(0)^(2)3x^(2)dx