$\int z\cdot\tan^2\left(z\right)$
$\frac{d}{dx}\left(e^{x-y}=cos\left(y-x\right)\right)$
$\int_1^2\left(8t^3+3t^2\right)dt$
$\lim_{x\to0}\left(\frac{\frac{1}{\sqrt{a+x}-2}-\frac{1}{\sqrt{a}-2}}{x}\right)$
$\cos\left(3x\right)=-0.3$
$-14\cdot\left(-20\right)$
$6\cos6x\:=\:2$
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