$f\left(x\right)=\left(-4\right)^3+3\left(-4\right)^2+2\left(-4\right)$
$\frac{2187}{729}\:$
$\frac{18}{6}$
$9b^2+12b=4$
$\cos\left(y\right)^2-\sin\left(y\right)^2+\sin\left(3y\right)$
$\frac{\left(x-2\right)}{\left(x+2\right)}+\frac{\left(x+2\right)}{\left(x-2\right)}=3$
$-x^2+6=x^2-4x$
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