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Math Help - trigonometry problem

  1. #1
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    trigonometry problem

    If :-

    Sin(theta) + sin^2(theta) = 1

    then prove that :-

    cos^2(theta) + cos^4(theta) = 1
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  2. #2
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    Quote Originally Posted by rickymylv View Post
    If :-

    Sin(theta) + sin^2(theta) = 1

    then prove that :-

    cos^2(theta) + cos^4(theta) = 1
    sin(θ) + sin^2(θ) = 1
    sin(θ)=1 - sin^2(θ) = cos^2(θ)
    So sin^2(θ) = cos^4(θ)
    Substitute it in the second equation to get the result.
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