$-\left(-2\right)-\left(-3\right)$
$\int2000\left(1+0.2x\right)dx$
$2\cot\left(x\right)\cot\left(2x\right)=\cot^2\left(x\right)-1$
$-\sqrt{2}+2\sqrt{2}$
$\frac{5^x-1}{4}+5^x$
$1-n^21+n^2$
$\frac{d^2}{dx^2}\left(sen\left(x\right)\right)$
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