$\lim_{x\to0}\left(\cos\left(x+\frac{\pi}{2}\right)^2.\cos\left(\frac{1}{x}\right)\right)$
$-157x-\left(-50y\right)+\left(-70x\right)+13y$
$47m^2-10+58m^2-3$
$-2u^2\left(-4u^2+u+4\right)$
$2\cdot10^{4}$
$\int x\sqrt{2x^2-1}\\:dx$
$\cos2x=2\cos x$
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