$14m=-196$

$f\left(x\right)=\frac{x^4-4x^3-2x}{6x^2}$

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

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

$f\left(x\right)=\sqrt{x}x$

$-2\cos\left(30\right)\sin\left(30\right)=\left(2-\sin\left(30\right)-\cos\left(30\right)\right)\left(1+\sin\left(30\right)+\cos\left(30\right)\right)$

$9x^2+30ax+25a^2$