$$\int\left(\frac{2x}{\sqrt[3]{x^{2}}}-3x\right)dx$$

$$\lim_{x\to-\infty}\left(\frac{5x-2x^2+1}{x\left(3+x^2\right)}\right)$$

$$\left(\frac{2}{x+3}\right)\left(\frac{x}{x+3}\right)$$

$$64x-\left(-38\right)+\left(38\right)x-\left(-36\right)$$

$$4\::-4+8-\left\{-4+2\:.-8\right\}$$

$$\cos\left(x-y\right)+\cos\left(x+y\right)$$

$$sin\left(cos^{-1}\left(\frac{2}{3}\right)+tan^{-1}\left(-\frac{3}{4}\right)\right)=sin\left(a+b\right)$$