$$0.455+0.455$$

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

$$t\frac{11}{t^2}$$

$$\lim_{x\to4}\left(3-\sqrt{x+5}\right)\frac{1}{1-\sqrt{x-5}}$$

$$43+5-\left(2+5+43\right)+2$$

$$\frac{3}{5}\sqrt{675a^4bx^9}$$

$$c^5+7\:c^5\:-7$$