$\int\left(\frac{1}{\sqrt{x}\left(1+x\right)^{\frac{7}{2}}}\right)dx$
$\sqrt{\sec^2\left(x\right)-1}=\tan\left(x\right)$
$-2\tan^2\left(x\right)+2\tan\left(x\right)+1=3\tan\left(x\right)$
$\left(-3\right)\cdot\left(-9\right)$
$98^{0.5}$
$\frac{m^4n^3}{9mn}$
$99+-2$
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