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March 27, 2017

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veify that each equation is an identity

cos2x+tan2xcos2x=1

sin4x-cos4x/sin2x=1-cot2x

  • MATH - ,

    Does cos2x mean cosine squared? cos^2(x)

    If so, then you have

    cos^2(x) + sin^2(x)/cos^2(x) * cos^2(x)
    = cos^2(x) + sin^2(x)
    = 1

    If you mean cos(2x) then the equation is not an identity (e.g.: x = pi/2)

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