$\int\frac{\left(x+2\sqrt{x}\right)\left(x-\sqrt{x}\right)}{x}dx$
$-65+32-7-19+39+6+20$
$-125+70-\left(-1\right)$
$\frac{sec^2a-1}{sina}=tana$
$\lim_{x\to0}\left(\frac{6sin\left(x\right)-\left(x\right)}{x^3}\right)$
$2^2\cdot3\cdot5^2$
$x^2+8x-15$
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