$\int\tg\frac{nx}{4}dx$
$\frac{d^2}{dx^2}\left(-4\sin\left(x\right)\right)$
$144a^2-96a+16$
$-5x+-3z$
$\int\left(2x+2\right)\cdot\left(sin\left(x\right)\right)dx$
$75r^2-27$
$\int\frac{2x^2+x-3}{x^2-2x}dx$
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