$$4n^0\cdot n$$

$$\cos\:\left(y\right)e^{xy}y+\left(xe^{xy}y+e^{xy}\right)\sin\:\left(y\right)$$

$$\frac{dy}{dx}\left(yz=ln\left(x+y\right)\right)$$

$$\left(7z+6x^2y\right)^2$$

$$8\left(n+1\right)$$

$$36x^2-48xy+16y^2$$

$$ln\left(lnx\right)\:=-1.9$$