What will be the final result of cos4x? Is it 2sin2x? How
Anuj , 9 Years ago
Grade 11
Trigonometry> What will be the final result of cos4x? I...
1 Answers
Himanshu
Last Activity: 9 Years ago
cos4x = cos2(2x) = cos^2(2x)-sin^2(2x)
= (cos^2x-sin^2x)^2 – (2sinxcosx)^2
=cos^4x+sin^4x-2sin^2xcos^2x – 4sin^2xcos^2x
then solve you can get the required results
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