$-cos4\frac{\pi}{2}$
$3x^2-22x+164$
$3.01+5$
$\left(-2\right)^2\::\:\left(-1\right)\:.\:\left(-2\right)$
$\frac{dy}{dx}=\cos\left(x+y\right)+\cos\left(x-y\right)$
$2\tan^2x+\sec^2x=2$
$\left(x-12\right)\left(x+5\right)$
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