$\frac{1}{9x+18}$
$\left(\sin\left(a\right)+\cos\left(a\right)^2\right)-\tan\left(a\right)\cdot\cos^2\left(a\right)=1+\sin\left(a\right)\cdot\cos\left(a\right)$
$\frac{dy}{dx}+\frac{2}{x}+x^2=sen2x$
$6xa-3x^2$
$x^3-8x^2-16x+108\le\:3$
$2350-1645$
$\left(3a+6\right)+\left(9a+6\right)$
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