$\cos\left(x\right)+\cos\left(x+120\right)+\cos\left(x+240\right)$
$\int\sqrt{cos3t}sen3t\:dt$
$\frac{dy}{dt}=2y-y^2$
$3\left(x^3-2\right)+6x\left(x^2+x\right)$
$-2x^2+8x+7$
$5y^2\cdot5y^2$
$\frac{1-tan^2x}{1-tan^4x}=cos^2x$
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