$cot^2d-cos^2d$
$5x^3-21x^2+5x-4$
$\left(x-y\right)\left(x^3+y^2\right)\left(x+y\right)$
$\frac{1}{2}\left(4+5\cdot2^3-2\right)+\left(-2\right)^3$
$\lim_{x\to4}\left(\frac{\sqrt[6]{5-x}-1}{x+4}\right)$
$4a^2-7;a=-1$
$1+10x\le1$
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