$x^2+15x=-20$
$-2\cdot\left(2\right)^2\cdot\left(-2\right)^2$
$\cos\left(\pi+x\right)=\sin\left(\pi-x\right)$
$\left(x^2-2y^2\right)^3$
$2x+8<-8$
$\left(x^2-2x-3\right)\left(x^2-2x-3\right)$
$\frac{2^{10}x^4}{2^{12}x^8}$
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