$3\:\sin\left(0^{\circ}\right)$

$\csc\left(x\right)\cdot\sec\left(x\right)=\sec\left(x\right)$

$-2+3\left[-5-4\left(2^2-3\right)\right]$

$\frac{d^2}{dx^2}\left(3x^2+1\right)$

$\frac{dy}{dx}=\frac{2x+sec^2x}{4y};\:y\left(\pi\right)=1$

$\frac{2x}{xy}$

$\left(\frac{1}{2}x^2+4y\right)^3$