$1x^3+7^2-x+28$

$x\sqrt{x^2}+4xd$

$\int_0^4\sqrt{1+\frac{9}{4}x}dx$

$\lim_{x\to0}\left(\frac{1+\tan\left(x\right)}{1+\sin\left(x\right)}\right)^{-\frac{1}{x}}$

$\frac{\left(0.84\cdot3\cdot10^8\frac{m}{s}\right)}{\left(3.10^8\frac{m}{s}\right)}$

$\left(5ax-3y^5\right)^2$

$3x^2-4+1$