$\frac{1+\tan x}{\sec x}=\sin x+\cos x$
$-\frac{72}{-4}$
$3n^2+24n+48$
$2y^2-2y+1$
$\cos a=\csc a.\tan a.\cos^2a$
$3^4\:x\:\:3^4\:x\:3^{-2}$
$\left(-1+x\right)^7$
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