Question

Find the integral
∫(cos(1/x)) /x^2 dx

Answer 1

Explanation:

∫(cos(1/x)/x² dx

`put~(1)/(x) =t\\diff.\\(-1)/(x^2) dx=dt\\\int(- cos~t~)dt=-sin~t+c\\=-sin ((1)/(x) )+c`