$\frac{cos^2x-sen^2x+cosx.senx}{cos^2x}$
$x^2+7x=-6$
$-2x^2+18-36$
$3\left(x+1\right)+\left(3-x\right)=7-3\left(1-x\right)$
$6a^2+8a+2$
$a^4b^2b^7$
$\frac{d^4}{dx^4}\left(x^7-2x^5-x^2+8x-4\right)$
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