$x^2+6x^2+9$
$-x^3+4x^2-1\:para\:x=-2$
$\left(mn^2-6\right)\left(mn^2+3\right)$
$-\frac{2}{3}x^{2}y^{2}+4xy+2x^{3}y^{3}-xy$
$3+6+4+4y$
$\left(x^{a+1}+1\right)^2$
$\sin^2\left(x\right)=1-\cos^2\left(x\right)$
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