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29 September, 14:03

Sin30=cos (2x) then x=

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  1. 29 September, 16:39
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    x = 30.

    Step-by-step explanation:

    Use the identity sin A = cos (90 - A).

    So sin 30 = cos (90 - 30) = cos 60.

    cos 2x = cos 60

    so x = 30.
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