$\lim_{x\to0}\left(\frac{3x+5}{2x+1}\right)$
$\frac{\cos^2x}{1-\cos^2x}+2\csc^2x=2\cot^2x$
$\sqrt[4]{25\:}\:x\:\sqrt[4]{25}$
$\left(2a^2-3a\right)-4\left(-3a^3+2a\right)$
$2\left(-2+6\left(7\right)+4\right)+0$
$\left(25-y\right)^2$
$2^5\:2^x$
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