$\sqrt{9-x}=2$
$\left(2x^2-4\right)\left(2x^2+4\right)$
$\csc\left(\frac{\pi}{2}-x\right)=\sec\left(x\right)$
$\int sen^3\left(bx\right)\cos\left(bx\right)dx$
$\sqrt{-98}$
$\left(10x+3b\right)^5$
$x-y'=xy$
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