$csc\left(\frac{\pi}{2}-u\right)$
$-x+3x-2\:si\:x\:es\:3$
$\frac{3x+9}{5-x}=0$
$2x-3<x+4$
$\int5\sin^4\left(x\right)cos^3\left(x\right)dx$
$-6-6\cdot3$
$\left(1+\sqrt{x+2}\right)^2$
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