$x=4s+2t$
$\csc^2x-4\cot x-2$
$\int x\left(3x+8\right)dx$
$\left(x-15\right)\left(x+20\right)$
$4+4\cos\left(\frac{\pi}{8}\right)\cos\left(\frac{\pi}{10}\right)$
$2-5\cos\left(x\right)=6$
$\left(m+21\right)^3$
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