Math, asked by talinnkoolstarpa9ftm, 1 year ago

why is cos^2x=1+cos2x/2

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talinnkoolstarpa9ftm: need help

talinnkoolstarpa9ftm: someone please tell me the first step only

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Answered by kirtiprasanjenpchfhd

3

actually cos 2x=2cos ^2x-1...and so we San write that also

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