$\left(+3\right)-\:\left(+5\right)-\:\left(-9\right)+\left(-23\right)+\left(+4\right)$

$\int\left(\sqrt{5t-2}\right)dt$

$\sqrt{2x+6+2\sqrt{x^2}+6x+2}$

$\left(x-3\right)^2\ge-x^2+1$

$5-\left(-1\right)\cdot\left(-3\right)$

$\int_{-\frac{\pi}{3}}^{\frac{\pi}{3}}\left(1-\frac{cos2x}{2}\right)dx$

$\left(-324\right)\cdot12$