$x^2+4x+40$
$2x^2+2x\cdot\:2x-5$
$\cos\left(\pi x\right)=-1$
$x^2-18x+81=0$
$\int9\left(3x+5\right)^2dx$
$\frac{sen^4\left(x\right)-cos^4\left(x\right)}{1-cot^4\left(x\right)}=sen^4\left(x\right)$
$2a^2\cdot2a^2$
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