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OpenStudy (anonymous):
Don't understand this concept! Please help!!!
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OpenStudy (anonymous):
Okay, so my question concerns the Half-Angle Identities of sin, cos, and tan. There's a plus/minus sign in front of the sqrt. How do I know when to use what? For an example, if the answer to cos (\[\alpha\]/2) is \[\frac {2\sqrt{5}}{5}\] HOW Do I know what quadrant it is in? My teacher said it was in teh 2nd quadrant, so it is negative. but I don't understand the p/m sign!! Please help!!!!!
OpenStudy (anonymous):
@hoblos @dpalnc anyone?
OpenStudy (hoblos):
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