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OpenStudy (df001):
Help with half angle question!
tanB=-8/15 and 270
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OpenStudy (df001):
The answer is \[\frac{ -4\sqrt{17} }{17 }\] but, why is it negative when the formula is +-
OpenStudy (df001):
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OpenStudy (df001):
If I am correct, is the answer a negative because, 135<1/2B<180 is on the second quadrant. Cosine is only positive on the fourth quadrant thus, the answer is negative because Cosine is on the second quadrant which is negative?
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