$\lim_{x\to\infty}\:-2^n-1$
$\frac{dy}{dx}\cos\left(x\right)=e^{-y}\sec\left(x\right)$
$-0,874\cdot100$
$\frac{dy}{dx}=\frac{y^2-2y}{y-1}$
$\tan\left(a\right)\left(1-\cot^2\left(a\right)\right)+\cot\left(a\right)\left(1-\tan^2\left(a\right)\right)$
$2cos^2\left(x-65\right)=1$
$\lim_{x\to\infty}\left(1-\frac{3}{x-6}\right)^{4x}$
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