$\left(2x-13\right)\left(2x-23\right)$
$\left(a^{x+1}-6\right)\left(x^{x+1}-5\right)$
$\int\frac{1}{sqrt\left(x^2+2x+2\right)}dx$
$5\left\{16-\left(-7\right)-\left[2+\left(\left(-5\right)\right)\right]\right\}$
$\cos\left(a\right)\sec\left(a\right)-\cos\left(a\right)=\sin^2\left(a\right)$
$2\:sen^2\left(a\right)+\:sen\left(a\right)=0$
$\frac{d}{dx}\left(2x^5+3x^3y-5xy^5=-9\right)$
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