$\frac{d}{dx}\:cot\:4x^3+5y^2$
$\lim_{x\to\infty}\left(\frac{e^n+e^{-n}}{e^{2n}-1}\right)$
$3-\left(-21\right)$
$-25\cdot7$
$12+\left(8-15\right)-\left(5+8\right)$
$\frac{2b^3x^2y}{3};\:b=-1;\:x=\frac{3}{5};\:y=8$
$x^6+4^4$
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