$\sqrt{5x^2}$

$-5\left(7y+6\right)+5\le-8\left(8-4y\right)$

$700-646,6$

$4\cos\left(x\right)^4-3\cos\left(x\right)^2+\sin\left(x\right)^2=1-\sin\left(2x\right)^2$

$\left(7+\sqrt{-16}\right)$

$\lim_{x\to0}\left(\frac{2xe^x}{ex-1}\right)$

$12a^2-8ab-5a^2+10-6ab-30+a^2-b^2$