Half angle identities....need a little help

c.lewis

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May 13, 2019
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Hey everyone, so im in the last week of this class and these are one thing I struggle with. Need help figuring these out
 

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How are cosine and secant related?

How is tangent related to both sine and cosine?
 
Can you write cos(\(\displaystyle \theta\)/2) and tan(\(\displaystyle \theta\)/2) in terms of sines and cosines? It is just the definition of cos(\(\displaystyle \theta\)/2) and tan(\(\displaystyle \theta\)/2)

Now can you label the three sides of a right triangle such that sec(\(\displaystyle \theta\)) = \(\displaystyle \sqrt{5}\)?

Now using this triangle and the half angle formulas can you now answer the questions?
 
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