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21 August, 23:55

What is the value of cos15

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  1. 22 August, 00:20
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    the value of cos 15 is √3+1/2√2

    explanation

    cos (45-30)

    =cos45*cos30+sin45*sin30

    =1/√2 * √3/2 + 1/√2 * 1/2

    =√6/4 + √2/4

    =√6 + √2/4

    =√3+1/2√2
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