$\log3\left(\sqrt{cos2x+2}\right)$

$\lim_{x\to\infty}\left(\frac{1}{x+4}\right)^{\frac{1}{x}}$

$3-\{3-[3-\left(3-3\right)]\}$

$x^2y\frac{dy}{dx}=1-x^2+y^2-x^2y^2$

$\lim_{x\to0}\left(\frac{2x-tan\left(x\right)}{\sqrt{x}}\right)$

$\frac{dy}{dx}=2ysin\left(x\right)$

$\left(-2\right).\left(+8\right)-\left(-5\right).\left(-6\right)+\left(-9\right).\left(+4\right)$