$\frac{csc^2\left(\theta\right)-1}{1+cot^2\left(\theta\right)}$
$\log_x\left(25\right)=2$
$\int-\frac{36}{x^2\sqrt{9-x^2}}dx$
$\frac{49}{+7}$
$y^2-21y-72$
$\frac{dn}{dw}+n=n\cdot w\cdot e^{w+2}$
$\frac{30y^3}{60y^2}$
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