Given and is in quadrant III, find the exact value of .
Note: You are not allowed to use decimals in your answer. =
$\displaystyle \cos(\frac{\alpha}{2})=-\sqrt\frac{1+-(\frac{4}{5})}{2}$
I need help with the math after this??
Given and is in quadrant III, find the exact value of .
Note: You are not allowed to use decimals in your answer. =
$\displaystyle \cos(\frac{\alpha}{2})=-\sqrt\frac{1+-(\frac{4}{5})}{2}$
I need help with the math after this??