$\lim_{x\to0}\left(\frac{x-\sin\left(x\right)}{e^x+e^{-x}-2}\right)$
$-13x<26$
$tan^2x=cos^2x+tan^2x\:cos^2x$
$\lim_{x\to0}\left(\frac{x^2}{\ln\cos\left(x\right)}\right)$
$-3+3x=-3$
$m^2-9m-850$
$\left(\frac{1}{2}+4ab\right)\left(\frac{2}{3}-4ab^2\right)$
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