$+\left(-1\right)-\left(+15\right)-\left(-13\right)+\left(+7\right)$
$-7x^2+14x+56$
$\int_2^4\left(\arcsec\sqrt{x}\right)dx$
$\frac{csc\left(x\right)}{cot\left(x\right)}=\frac{1}{cosx}$
$\cos2x+\sen2x=1$
$\lim_{x\to+0}\ln\left(x\right)\left(e^x-1\right)$
$\lim_{x\to3}\left(\frac{x^3-1}{x^3-2x^2-3x}\right)$
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