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27 January, 10:32

1-cos^2 (12) - cos^2 (78) simplified with radicals if needed

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  1. 27 January, 11:04
    0
    Hints:

    Check with a calculator to see what you get.

    Then try to simplify the above expression using the following identities.

    1-cos^2 (x) = sin^2 (x)

    sin (x) = cos (90-x)
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