Evaluate the following expressions.
Note: Your answer must be in EXACT form: it cannot contain decimal numbers. Give the answer either as 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).

If $\theta = \frac { -4 \pi } { 3}$, then

$\sin ( \theta ) =$
$\cos ( \theta ) =$
$\tan ( \theta ) =$
$\sec ( \theta ) =$