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13 August, 19:30

Convert this identity to one using sine term (s) only.

1-2cos (r) ^2

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  1. 13 August, 19:36
    0
    Pythagorean identity:

    sin²+cos²=1

    Then cos²=1-sin²

    Substitute:

    1-2cos²

    1-2 (1-sin²)

    1-2+2sin²

    2sin²-1
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