Evaluate:
(i) `int (5x^2 + 2x^(-5) -7x + 1/(sqrtx) + 5/x) dx`
(ii) ` int 3sin x -4 cos x + 5 sec^2x -2 cosec^2x)dx`
(iii) `int (1-x)(2+3x)(5-4x)dx`
(iv) `int ((3x^4 -5x^3+4x^2x+2)/(x^3))dx`
(v) `int (x^2 + 1/(x^2))^3dx`