$\sin\left(x\right)^2\left(1-\csc\left(x\right)^2\right)=\cos\left(x\right)^2$
$36-\left(64+2\cdot1\cdot9\right)$
$\left(29+x\right)\left(-29+x\right)$
$\left(\sec^2\left(u\right)-1\right)\left(\csc^2\left(u\right)-1\right)$
$\frac{2m^3-6m-6m^2}{n}$
$x^'\:=\:ax$
$9>-2-x$
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