$-3x-5\le4-x$
$\frac{sec\left(x\right)\left(cos\left(x\right)+1\right)-1}{csc\left(x\right)\left(sen\left(x\right)+1\right)-1}$
$-7\:+\:9\:\cdot\:-3\:+\:1$
$\frac{2x}{2x+4}=\frac{3x}{x+2}$
$\sqrt{3}\tan\left(x\right)=0$
$\csc^2x+1=-\cot^2x$
$\frac{dy}{dx}=e^{4u+9t}$
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