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17 November, 04:42

If cos x = sin (20 + x) ° and 0° < x < 90°, the value of x is

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  1. 17 November, 07:11
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    Draw a right angle triangle

    Let one of the angles be A

    cos A = sin (90-A)

    90 - x - 20 = x

    2x = 70

    x = 35 degrees
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