$\frac{2}{\left(\csc\left(x\right)+1\right)\left(\csc\left(x\right)-1\right)}$
$\tan^2\left(x\right)-\tan^2\left(x\right)\csc^2\left(x\right)$
$20+90+514a$
$15-3+36-4+0+8$
$49x^2-64t^2$
$84^2$
$\left(2a+3y\right)^2$
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