$y^4-6y^2z+9z^2$
$\left(cosx-1\right)\left(cosx+1\right)$
$\frac{d}{dx}xy-3x+4x^2=7$
$3x^2+18x=45$
$1-\left(cosx-sinx\right)^2=sin2x$
$\frac{\sen^{2}x-5\senx+2}{\sen^{2}x-4}=\frac{2\sen-1}{\senx+2}$
$x-3x^2+4-3x^2$
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