$100+8\cdot3^2-63\left(2+5\right)$
$-\frac{5x-6}{x+1}$
$\lim_{x\to\infty}\:\frac{2x-6}{x^2-9}$
$12x-14=-2x^2$
$0.0024-0.024$
$\lim_{x\to2}-\arcsin\left(\frac{1}{2}\right)$
$9cos^2x=-10cosx-1$
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