Question
$\int_{}^{} {\frac{{\sin x}}{{{{\cos }^2}x}}\;dx} $
$\cos x = t $ रखने पर $ \Rightarrow \sin x\,dx = - dt$
$\therefore \,\,\,I = \int_{}^{} {\frac{{ - dt}}{{{t^2}}}} = \frac{1}{t} + k = \sec x + k$.
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