$5\cot^2\left(a\right)+5$
$\ln\left(z\right)=x$
$=\tan^{2}\alpha\left(\ran^{2}\alpha-1\right)$
$12x-1<3$
$\left(a+30\right)\left(a-4\right)$
$\frac{x-3}{5}+\frac{x-5}{3}\le2$
$x\frac{dy}{dx}-2y=2x^3$
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