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OpenStudy (anonymous):
Given that sin B=2/3 and π/2≤ B≤π find cos B
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OpenStudy (mertsj):
So we know that the angle is in the second quadrant and therefore the cosine will be negative. |dw:1392952613557:dw|
OpenStudy (mertsj):
What is the cosine?
OpenStudy (anonymous):
i got a positive answer, but my teacher told me it's suppose to be negative. I don't understand why though.
OpenStudy (mertsj):
Because the cosine is like x and is negative in quadrants II and III
OpenStudy (anonymous):
√5/3 cosine
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OpenStudy (anonymous):
oh okay thank you
OpenStudy (mertsj):
NEGATIVE sqrt5/3
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