What identity is this?

  • Thread starter Peon666
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  • #1
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While seeing a signals example problem, I encountered this:

cos^2 (wt+θ) = [1+cos(2wt+2θ)]

What identity is this?
 

Answers and Replies

  • #2
Doc Al
Mentor
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1,398
That doesn't seem right. Looks like they missed a factor of 2:

cos(2x) = 2cos^2(x) - 1
 

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