Tìm a) \(\int {\left( {x + {{\sin }^2}\frac{x}{2}} \right)dx} \); b) \(\int {{{\left( {2\tan x + \cot x} \right)}^2}dx} \).

Tìm

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

b) \(\int {{{\left( {2\tan x + \cot x} \right)}^2}dx} \).