Question
If cos4B = sin(B - 10Ā°), then find the measure of 'B'.
Solution
We know that, cosA = sin(90Ā° - A) cos4B = sin(B - 10Ā°) Or, sin(90Ā° - 4B) = sin(B - 10Ā°) Or, 90Ā° - 4B = B - 10Ā° Or, 4B + B = 90Ā° + 10Ā° So, B = (100Ā° / 5) = 20Ā°
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