$\left(+20\right)-\left(-15\right)$
$12a^2x+y;\:x=7;\:y=10$
$\int arcosx\:dx$
$-\infty-7$
$l\lim_{x\to0}\:\frac{sin^2\left(2x\right)}{x^2}$
$2\left(ax-3\right)=8x-b$
$\left(2y-3z+2\right)^2$
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