$\int7\left(2x+4\right)^{20}dx$
$abc=45$
$\left(-4\right)-\left(-11\right)-\left(-5\right)+8$
$\lim_{x\to\infty}\left(9x\left(e^{\frac{2}{x}}-1\right)\right)$
$\left(x^2-7\right)\left(x^2-6\right)$
$\tan\left(\frac{x}{2}\right)=\frac{\tan\left(x\right)}{\sec\left(x\right)+1}$
$\int_{-1}^0e^{-x}dx$
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