$4x+1<13$
$x^2+3x+2x+6$
$12.30\:x\:0.75$
$\frac{d}{dx}\left(sen\left(y-x^2\right)-ln\left(y-x^2\right)+2\sqrt{\left(y-x^2\right)}\right)$
$\frac { t - x } { x }$
$\csc\left(-x\right)=-\frac{5}{4}$
$-n^2-n^2$
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