$$\frac{dy}{dx}\left(\frac{1}{\left(2x+1\right)\left(x+1\right)}\right)$$

$$3x-7^5$$

$$3\:.\:\left(5\:+\:12\right)\:+\:4\:-\:15:3\:$$

$$\tan^2x-3\sec\left(x\right)-2$$

$$sin\:y\:=\:2$$

$$\int\:6e^{-7x}dx$$

$$\lim_{x\to\infty}\left(\frac{4+4x-2x^2}{e^x}\right)$$