$\int_{\frac{7}{2}}^7\left(\sqrt{49-x^2}\right)dx$
$\frac{x^2+7x+7}{3x+3}$
$9^5\cdot\:4^5$
$2x^4\left(2x\right)$
$25-81y^6$
$935\:=\:17\left(f\:+\:14\right)$
$\:2ab+4a,\:a=3,\:b=1$
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