$625\:x\:\left(-35\right)+625\:x\:\left(-65\right)$

$\frac{x+3}{3}\le2x-4$

$\lim_{h\to0}\left(\frac{\frac{1}{\left(a+h\right)^2}-\frac{1}{a^2}}{h}\right)$

$\left(43x+86\right)^2$

$2+5-1+5-2+2+3$

$\lim_{x\to2}\left(\sqrt{4y^2-2y}\right)$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{\cos\left(x\right)}{cos\left(x+\pi\right)}\right)$