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OpenStudy (anonymous):
Find an exact value. cos(π/12)
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pooja195 (pooja195):
cos(pi/12) = 0.9659...
zepdrix (zepdrix):
Exact value? Hmm I guess we have to use the `Half-Angle Identity for Cosine`.
OpenStudy (anonymous):
no this is trigonometry with unit circles, you need to find what quadrant pi/12 is and then find the x coordinate since this is cos
OpenStudy (anonymous):
yeah. @zepdrix
zepdrix (zepdrix):
Cha pi/12 is not a special angle. we need to get it into one of those angles before we can use the unit circle c:
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OpenStudy (anonymous):
|dw:1361922889679:dw|
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