$1+\frac{tan^2x}{cot\:x}$
$\int\left(x\cdot\cos\left(2x^2+2\right)\right)dx$
$\lim_{x\to\infty}\left(\frac{6-4x^2+x^3}{4+5x-7x^2}\right)$
$\tan\left(x\right)=5.7$
$\frac{dy}{dx}=\frac{x^3-2}{xy}$
$\frac{d}{dx}y=2\cot8x^4$
$ec^{-1}\sqrt{2}$
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