" 8."int(x^(2))/(1+x^(2))dx

int(2x^(3))/(1+x^(8))dx

(i) int((x^(2) - 1)/(x^(2) + 1))dx , (ii) int ((x^(6)- 1)/(x^(2) + 1))dx (iii) int ((x^(4))/(1+x^(2)))dx , (iv) int((x^(2))/(1+x^(2)))dx

Evaluate : (i) int(3x^(2))/((1+x^(6)))dx (ii) int(x^(3))/((x^(2)+1)^(3))dx (iii) (x^(8))/((1-x^(3))^(1//3))dx

int(8^(2+x)+2)/(2^(x+3))dx

int(7x-8)/(x(x-1)^(2))dx

int(dx)/(5-8x-x^(2))

int(2x-3)/(8+3x-x^(2))dx

Evaluate: int_(1)^(2)(1)/((x+1)(x+2))dx( ii) int_(1)^(2)(1)/(x(1+x^(2)))dx

If int_(0)^(a)(1)/(1+4x^(2))dx=(pi)/(8) , then a =