`int_9^1 x^3sqrt(1+3x^4)dx`

" 1."int x^(3)sqrt(3+5x^(4))dx

int x^3 sqrt(x^(4)-1)dx

(1) int x^(3)sqrt(x^(4)+5)dx

(i) int_0^1 (dx)/sqrt(1-x^2) (ii) int_0^1 (dx)/sqrt(1+x^2) (iii) a int_1^sqrt3 (dx)/(1+x^2) b int_0^1 (dx)/(1+x^2) (iv) int_0^(2//3) (dx)/(4+9x^2) (v) int_0^1 x/(x^2+1)dx (vi) int_2^3 x/(x^2+1) dx

(1) =int(x^(3))/(sqrt(1-x^(4)))dx

int(4x^3)/(sqrt(x^(4)-1))dx=

int (1+x)^3/sqrt x dx

int((1+x)^(3))/(sqrt(x))dx

int((1+x)^(3))/(sqrt(x))dx