$$\left(5x^2+4y^3\right)^5$$

$$8x^2-2y^2+y+4x^2-10y+7x^2+9x^2-25$$

$$x^2-15x+132$$

$$\lim_{x\to0}\left(\frac{\tan\left(6x\right)}{\tan\left(2x\right)}\right)$$

$$3r^3\left(2r^3\right)$$

$$\frac{4x+2}{2\sqrt{5}}$$

$$-150\cdot20$$