Question
$(\sec 2A + 1){\sec ^2}A = $
$= \left( {\frac{{1 + {{\tan }^2}A}}{{1 - {{\tan }^2}A}} + 1} \right)\,(1 + {\tan ^2}A)$
$ = \frac{{2\,(1 + {{\tan }^2}A)}}{{1 - {{\tan }^2}A}}$
$= 2\sec 2A.$
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$f(x)=\left\{\begin{array}{ll}\frac{\cos ^{-1}\left(1-\{x\}^{2}\right) \sin ^{-1}(1-\{x\})}{\{x\}-\{x\}^{3}}, & x \neq 0 \\ \alpha, & x=0\end{array}\right.$ $x =0$ पर संतत है, जहाँ $\{ x \}= x -[ x ],[ x ]$ महत्तम पूर्णांक $\leq x$ है। तो