Question
If cos2B = sin(2B - 30°), then find the measure of 'B'.
Solution
We know that, cosA = sin(90° - A) cos2B = sin(2B - 30°) Or, sin(90° - 2B) = sin(2B - 30°) Or, 90° - 2B = 2B - 30° Or, 2B + 2B = 90° + 30° So, B = (120° / 4) = 30°
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