$\int\frac{sec^2x+2}{tan\:x}dx$
$\left(\sec\left(x\right)+1\right)\left(\sec\left(x\right)+1\right)=\tan\left(x\right)^2$
$\left(2a^4+7b\right)\left(2a^4-7b\right)$
$-2r^2+12r+74=0$
$\left(-1^2+2\left(-1\right)\right)$
$\lim_{x\to0}\frac{\left(3x-3\right)\cdot sinx}{5x^3}$
$y=\frac{x^3}{21}+\frac{7}{4x}$
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