$2a^2-7a^2-a^2+4a^2$
$\left(x+y\right)\frac{dy}{dx}=3$
$\int cot\left(48x\right)dx$
$\csc\left(90-x\right)\cot\left(x\right)$
$-2\cos^2\left(x\right)-\sin\left(x\right)+1=0$
$\int\left(\frac{2x+5}{x^2+36}\right)dx$
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