" 26.(i) "int(x^(2)+1)/(x^(4)+1)dx=dots

(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

(i) int ((1+x)^(3))/(sqrt(x))dx " "(ii) int((1+x)^(3))/(x^(4)) dx

(i) int ((1+x)^(3))/(sqrt(x))dx " "(ii) int((1+x)^(3))/(x^(4)) dx

I=int(1-x^(2))/(x(1-2x))dx

I=int(sqrt(x^2+1))/(x^(4))dx

I=int(2x^(3)+4x+1)/(x)dx

I=int(x)/(x^(4)-x^(2)+1)dx

" 4.(i) "int(sin x)/(1-sin^(2)x)dx

Evaluate: (i) int(1)/(a^(2)x^(2)-b^(2))dx (ii) int(x^(2)-1)/(x^(2)+4)dx

(i) int (x^2+1)/((x^2+4)(x^2+25)) dx (ii) int (2x^2+1)/(x^2(x^2+4)) dx