$-x^2-2x-3$
$4a^2-22+121$
$1+\tan\left(a\right)\cdot1-\tan\left(a\right)+\sec^2\left(a\right)=2$
$\frac{1}{\cos\left(x\right)+\sin\left(x\right)\cos\left(x\right)}=\frac{1-\sin\left(x\right)}{\cos^3\left(x\right)}$
$x^2=-5$
$3x^2-18x+9^2$
$\frac{d}{dx}x^3.y^3-x=y$
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