$\int\left(3x+7\right)^6dx$
$4y+2\left(y+1\right)=y+5\left(y-3\right)$
$\cos\left(30\right)=\frac{x}{24}$
$2^{\left(90-40\right)}$
$\frac{e^{-x}}{xe^x}$
$\int\:\frac{x^2+1}{\left(x+2\right)^2}dx$
$9-\left(a+1\right)^6$
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