What identity is this?

  • Thread starter Peon666
  • Start date
  • #1
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Cos^2 (wt+a) = 1+Cos(2wt+2a)

?
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Hi Peon666! :smile:

(have an omega: ω and try using the X2 tag just above the Reply box :wink:)
Cos^2 (wt+a) = 1+Cos(2wt+2a)

?

(hmm … there's a factor of 2 missing :rolleyes: …)

You need to learn all the standard trigonometric identities …

this one is 2cos2x = 1 + cos2x

(rather like 2sin2x = 1 - cos2x …

try adding and subtracting them :wink:)
 
  • #3
108
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I'm indeed ashamed that I'm studying Signals course and not aware of complete trigonometric identities. Thanks a lot for your help.
 

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