Question
$\int_0^1 {\frac{{dx}}{{{e^x} + {e^{ - x}}}}} $ का मान है
${e^x} = t$ रखने पर, ${e^x}dx = dt$
साथ ही, जब $x = 0$ से $1$, तब $t = 1$ से $e$,
$\int_1^e {\frac{{dt}}{{1 + {t^2}}} = [{{\tan }^{ - 1}}t]_1^e} = {\tan ^{ - 1}}\left( {\frac{{e - 1}}{{e + 1}}} \right)$,
$\left[ \because {{\tan }^{-1}}x-{{\tan }^{-1}}y={{\tan }^{-1}}\left( \frac{x-y}{1+xy} \right) \right]$.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.