Asked by Kyler
Prove sin(4x)= (4sinxcosx)(2cos(x)^(2)-1
Answers
Answered by
drwls
Think of how the right hand side looks like the product of 2 sin(2x) and cos(2x)
The next step should be obvious: use the double angle identity again.
The next step should be obvious: use the double angle identity again.
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