$$3y^2-20y+12$$

$$\left(2x^5-3x^4+4x^2-1\right):\:\left(x^2-4x+2\right)$$

$$x2+9x-81$$

$$\lim_{x\to\infty}\left(\frac{\tan\left(x\right)}{3x}\right)$$

$$2x-5y-2z+4x-6y-z$$

$$2\left(1-\cos\right)+\cos^2=1+\sin^2$$

$$ay-by+cy$$