$3\sqrt{216\cdot125}$
$\left(7-1\right)\cdot5$
$140,30\:-\left(7\right)$
$\int\left(tanx\:11secx\right)dx$
$\frac{1+\cot^2}{\csc^2-1}$
$\sqrt{x^2-7}+\left(\frac{x^2}{\sqrt{x^2-7}}\right)$
$\int4x^2e^{-4x}dx$
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