I want to show that (sin2kx / 2sinx) + cos(2k-1)x = sin(2k+2)x / 2sinx
I presume I could convert the cos expression to sin first. This is more difficult than the trigonometry I normally do.
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Thanks, that was more work than I thought it would be. You have made a mistake at the 5th line and further. The last + should be -.
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