$x^2+3x+21=22$
$2sinxcosx=\sqrt{2}cosx$
$1\:+\:\tan^2\:=\frac{5}{4}$
$\frac{d}{dx}\left(ex^{-\frac{8}{x}}\right)$
$5\left(-4\:+\:3z\right)$
$\int x\cdot\sqrt{7-x}dx$
$4\left(x+1\right)<2x-8$
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