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Cos(x+y)=cosxcosy-sinxsiny show sin2x cos2x

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Cos(x+y)=cosxcosy-sinxsiny show sin2x cos2x

    • Posted by Rekha Patil 3 years, 11 months ago

    CBSE > Class 11 > Mathematics
    • 1 answers

    Sambhav Jain 3 years, 11 months ago

    Cos(x+x) = cosxcosx-sinxsinx Cos2x = cos^2 x - sin^2 x = 2cos^2 x - 1 =1 - 2sin^2 x We know that sin(x+y) = sinxcosy+cosxsiny => sin(x+x) = sinxcosx+cosxsinx => sin2x = 2sinxcosx

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