$$\int3^{2x}\:dx$$

$$\frac{1}{sec\:a-tan\:a}=\:sec\:a+\:tan\:a$$

$$\frac{d^2}{dx^2}\left(x^2+9y^2=81\right)$$

$$\frac{dy}{dx}\csc\left(x\right)=\frac{y^3}{2}$$

$$-16\cdot201$$

$$4^2-4\left(1\right)\left(4\right)$$

$$\ln\left(x+2\right)+\ln\left(3\right)=\ln\left(x\right)$$