Evaluate the following integrals

(i) Using partial fractions

Upper limits = 4 Lower limits = 2
x^2 / (x-3)(x+1) dx

(ii) Using by parts approach

Upper limits = pie / 2 Lower limits = 0
x^2 cos(x) dx

(iii) Using substitution approach

Upper limits = 3 Lower limits = 2
x sq root around (x^2-2) dx

hope someone can help and make it clear for me .....Many thanks!!!