$\lim_{x\to0}\left(\frac{x+\sin\left(2x\right)}{3x}\right)$

$49^2+35x+4$

$\sec\left(a\right)-\cos\left(a\right)=\tan\left(a\right)\cdot\sin\left(a\right)$

$\left(\frac{4y^2z^{\frac{2}{3}}}{x^{\frac{1}{2}}}\right)^2\:.\:\left(\frac{x^{-3}y^6}{8z^4}\right)^{\frac{1}{3}}$

$\left(2x-5\right)^2=4x^2-20x+25$

$2x^2+5x+20$

$-8<x-10$