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OpenStudy (anonymous):
Please help! I need help with the problem attached
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OpenStudy (anonymous):
OpenStudy (anonymous):
at first do you the formula of cosA in terms of sinA/2
OpenStudy (anonymous):
Use: \[\large \sin^2(\frac{A}{2}) = 1 - \cos^2(\frac{A}{2})\]
OpenStudy (anonymous):
@waterineyes I think cosA is given not cosA/2
OpenStudy (anonymous):
use this one:|dw:1343644435832:dw|
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