$7-\left(32-45\right)-6+\left(12-45\right)$

$\lim_{x\to\frac{\pi}{2}}\left(\frac{tanx}{tan\:3x}\right)$

$2\cos\left(x\right)+2\sqrt{3}=\sqrt{3}$

$x^2-x^5+x^2$

$5n+11=46$

$\int\:te^{-6t}dt$

$-\left(+849\right)-\left(336\right)-\left(-1077\right)-\left(+9\right)-\left(-49\right)-\left(-2\right)$