Tìm: a) \(\int {\frac{{{{\left( {x + 2} \right)}^2}}}{{{x^4}}}dx} \); b) \(\int {\sqrt x \left( {7{x^2} + 6} \right)dx} \).

Tìm:

a) \(\int {\frac{{{{\left( {x + 2} \right)}^2}}}{{{x^4}}}dx} \);

b) \(\int {\sqrt x \left( {7{x^2} + 6} \right)dx} \).