$2\cos a+\sqrt{3}=0$

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

$\left(\frac{\left(x\right)}{\left(1+x\right)}\right)^3$

$2\sqrt{22}\cdot\frac{\sqrt{3}}{2}$

$\left\{\left[-2\left(6a+5b-21\right)-3b\right]-\left(2a-3b+14\right)\right\}$

$\frac{1}{2}\tan\left(x\:+30\right)=\sin\left(2x\right)$

$\frac{3}{2}ty\left(t\right)\left(1-\frac{y\left(t\right)}{500}\right)$