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5 March, 15:52

Find the exact value of cos 75 by using a sum or difference formula

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  1. 5 March, 19:15
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    Cos 75 = 45 + 30

    Formula: cos 45 x cos 30 - sin 45 x sin 30

    Cos 45 = root 2 / 2

    Cos 30 = root 3 / 2

    Sin 45 = root 2 / 2

    Sin 30 = 1 / 2
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