$$\lim_{x\to0}\left(\frac{1+2\cos\left(x\right)-3e^{-x^2}}{2sin^2\left(x\right)}\right)$$

$$\left(9^5\right)^7$$

$$\lim_{x\to+\infty}\left(1+\frac{1}{x^2}\right)^x$$

$$\left(4x\:+\:5y\right)\left(x\:+\:6\right)$$

$$\frac{dy}{dx}\:+\:4y=\frac{5x^3\:+\:3}{1}\:$$

$$4\left(8x+1\right)-6\left(1-8x\right)$$

$$8\left(3\right)+5$$