$$5x^4-20$$

$$\lim_{x\to0}\left(\frac{\left(2\cdot n+1\right)sin\left(x\right)-sin\left(\left(2\cdot n+1\right)x\right)}{4sin^3\left(x\right)}\right)$$

$$\int xcos\left(2x+2\right)dx$$

$$x^4+2x^3y^2-2x^3z$$

$$\left(3x^2-5x-8\right)$$

$$\left(4h+5k\right)^3$$

$$\lim_{x\to\infty}\left(8-10x\right)$$