$-\left(9-4+5\right)-\left(-3+11\right)$
$\lim_{x\to0}2^{\frac{1}{x}}$
$\cos2\left(x\right)-\cos\left(x\right)-2=0$
$\frac{dy}{dx}=\frac{c}{x}+\frac{x^4}{5}$
$\tan^4z-\sec^2z$
$8s^2\:-\:5s^2\:-\:\frac{1}{2}s^2$
$7.6\cdot66$
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