Evaluate the following expressions.
Note: Your answer must be in EXACT form: it cannot contain decimals. It must be either an integer or a fraction. If the answer involves a square root write it as sqrt . For instance, the square root of 2 should be written as sqrt(2).

$\sin (-\frac{2\pi}{3}) =$
$\cos (0) =$
$\tan (-\frac{\pi}{3}) =$
$\cot (\frac{3\pi}{4}) =$
$\sec (\frac{\pi}{3}) =$
$\csc (\frac{\pi}{6}) =$