$\cos2x-2\sin^2x+3=2$
$\frac{x^6+2}{x-2}$
$\left(x+1\right)\sqrt{x^2+1}$
$18\cdot2a^2$
$\int\sin^3x\:sen^5x\:dx$
$2cos\left(3\:\theta\:\right)\:=\:-\sqrt{2}$
$\left(csc\theta\:-cot\theta\:\right)$
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