$\lim_{x\to0}\left(\frac{4sinx-2x^2}{x^2}\right)$

$6\left(cos210+sen210\right)$

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

$\left(+10\right)+\left(-16\right)-\left(-3\right)-\left(+20\right)$

$x^2-2xm+m^2+k$

$\lim_{x\to0}\left(\arccos\left(\frac{\left(1+x^2\right)}{1+2x^2}\right)\right)$

$\frac{dy}{dx}=\frac{\left(e^x\right)}{y}$