$\sqrt{a}-\sqrt{a}$
$n^2=23$
$8\left(-10v+-5\right)$
$x=-x^2+12x-20$
$y'=y^2\left(1+t^2\right)$
$\frac{d}{dx}mx$
$\sec\left(x\right)^2-\csc\left(x\right)^2.sen\left(x\right)^2=sen\left(x\right)^4$
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