Question

If Sin 3A = Cos (A - 46°) where 3A is acute angle, then the Value of A is

A 56° Correct Answer Incorrect Answer
B 44° Correct Answer Incorrect Answer
C 46° Correct Answer Incorrect Answer
D 34° Correct Answer Incorrect Answer

Solution

Sin 3A = Cos (A - 46°) Sin 3A = Sin [90° -(A - 46°)] 3A = 90° - A + 46° 4A = 136° A = 34°

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