How can you rearrange this formula to correctly find cosθ?

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  • 4 months ago
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    1) square both sides

    sin^2(T/2) = (1 - cos(t))/2

    2) multiply both sides by 2

    2sin^2(t/2) = 1 - cos(t)

    3) subtract 1 from both sides

    2 sin^2(t/2) - 1 = -cos(t)

    4) multiply both sides by -1

    1 - 2sin^2(t/2) = cos(t)

    It is the penultimate choice

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