$\sin\left(x+x\right)=2\sin x\cdot\cos x$
$log3\:\left(x\:-\:3\right)\:=\:2$
$\lim_{x\to-\infty}\frac{2+x}{\sqrt{6y^2-7}}$
$16x^4-81y^2$
$\left(3-x^3\right)^2$
$\frac{dy}{dx}=\frac{\left(xy\right)}{x^2-y^2}$
$\left(3xy^2\right)-\left(2xy\right)^3$
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