$csc\left(-x\right)=-cscx$
$f\left(x\right)=\frac{\sqrt[2]{x}+\sqrt[3]{x}}{\sqrt[2]{x}}$
$\left(4x+1\right)^2\le\:0$
$yx^2dx=ydx-x^2dy$
$x-21=6$
$2x^2+12x+11$
$2x+5=25$
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