$\sec^2-6\sec\csc+9\csc2$
$-5^2+8-7$
$\int\left(x+2\right)\left(x+5\right)^2dx$
$\frac{\left(x^2-x\right)}{\left(x-2\right)^3}$
$\frac{m-2}{4}=\frac{m-3}{5}$
$2a-2b-5b+9a$
$2\frac{dy}{dx}+6y=50$
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