$\lim_{x\to0}\left(\frac{sinx}{\sqrt{1-x}-1}\right)$
$\left(b-n\right)\left(c-n\right)+4a^2$
$-3=x+5$
$\frac{\tan a-\cot a}{\tan a+\cot a}=1-2\cos^2a$
$10x-3y=36$
$\left|-8\right|>-\left(-5\right)$
$3\left(x+12\right)=5x+10$
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