$sin\left(180+x\right)$
$y^8-5y^4+4$
$\:x^3-3x^2-3x+9$
$\left(a^5\right)^4$
$\frac{\cot^2\infty+1}{\cot\infty\sec^2\infty}=\cot\infty$
$\frac{dz}{dy}=-1-zy$
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