$\left(4x^2+5x+6\right)+\left(5x^2-7x-7\right)$
$\left(6+5n\right)\left(6-5n\right)$
$\int_5^{\infty}\left(16xe^{-x^2}\right)dx$
$\lim_{x\to0}\left(\frac{\cos\left(x\right)+x^2-ln\left(e+x\right)}{e^x}\right)$
$\cos\frac{\pi}{2}-x\cdot\sec\left(x\right)$
$\int e^{-x}du$
$\left(2x^2-x^5\right)^3$
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