$2+2\sqrt{2xy}+2y$
$\cos\left(a\right)\left(\tan\left(a\right)+1\right)+\cos\left(a\right)$
$\lim_{x\to0}\:\left(a^x-b^x\right)\:\frac{1}{x}$
$\frac{cot^2\left(x\right)-\cos^2\left(x\right)}{cot^2\left(x\right)cos^2}$
$\frac{\infty1}{12}$
$\left(x^2-2xy\right)y'=y^2$
$-7\cdot x<7$
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