Integrate x(f(x))6 dx, using the substitution u = f(x).( where f(x) is 9x^2 -4

Integrate x+2/f(x) dx where f(x) is 9x^2 -4

Integrate 1/(4-9x^2)^1/2 dx

Please a step by step process is appreciated as I am horrible in integration and need help, Thank you for your help =)