$\frac{1}{\csc\left(x\right)+1}-\frac{1}{\csc\left(x\right)-1}=2\sec\left(x\right)\tan\left(x\right)$
$-4cos^2o+2$
$4m^2+48m+144$
$\frac{\left(x^2+x+2\right)^1}{x-1}$
$-24m-34m$
$\frac{1}{2}\left(4-z\right)$
$+6-4\cdot2$
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