$$2^4\:+\:\left(-19\right)+\:65$$

$$\frac{48}{8x}$$

$$\left(2x+5\right)\left(x-8\right)$$

$$\int\csc^2\left(9t-3\right)dt$$

$$\frac{d}{dx}\left(y^5+xy^2=24\right)$$

$$cot\left(x+\frac{\pi\:\:}{4}\right)=\frac{1-tanx}{1+tanx}$$

$$98\frac{1}{2}$$