$\cos\left(x+y\right)\cos\left(y\right)-\sin\left(x+y\right)\sin\left(y\right)$
$\left(\sqrt[3]{x^2}\right)\left(\sqrt{x^3}\right)$
$\left(16x^2-81\right)\left(4x+9m\right)$
$\frac{dy}{dx}=\frac{5+t^2}{ut^2+u^4t^2}$
$3x^2-x+1$
$121x^2+44xy+4y^2$
$4\cdot18$
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