$20x+12xy+4xz$
$sin\left(\frac{2\pi}{3}-\frac{3\pi}{4}\right)=sinucosv-cosusinv$
$\left(2y^2-x\right)^5$
$\frac{1}{ts^2+s}$
$716-353$
$\frac{1+\frac{1}{c-1}}{1-\frac{1}{c-1}}$
$3csc^2x-4=0$
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