$\frac{\cos^{4}\theta-\sen^{4}\theta}{\cos\theta-\sen\theta}$
$4\left(3-2\right)-3\left(-2+2\right)+3\left(3\right)^3$
$5m^2-9m-2=0$
$-5+7\cdot2$
$e^{-x}y\frac{dy}{dx}=e^{-y}+e^{-y-x}$
$1+\frac{5}{x-1}=\frac{3x+7}{x^2-1}$
$\left(-2g+3\right)^2$
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