$\tan^2x-1=2$
$y'+2y=x^2e^{-x}$
$\int\:x\:e^{18x}\:dx$
$7\cdot2^3-3\cdot2^2-2+10$
$3\frac{dy}{dx}-3y=0$
$\int_0^ax^3\sqrt{a^2-x^2}dx$
$\int4\cos\left(x\right)\cot\left(x\right)dx$
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