$\left(4+2\right)-\left|7-\left(-3-5-7\right)\right|$
$\int x\cdot\left(\cos x+1\right)dx$
$sec^2x=1-tanx$
$\int\left(\frac{e^{-2x}}{-2}\right)dx$
$\left(x^3+x+1\right)+2x^3+5x^2+3x+1$
$\left(3x-4\right)\left(4x+3\right)$
$\sqrt{\frac{a^2}{36}}$
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