Question

If sin (2A+ 45°) = cos(30-A) and 0°<A<90°. find the value of A​

Answer 1

sin (2A+ 45°) = cos(30-A)

Sin(2A+45°) = sin(90 - 30 +A)

By comparing

(2A+45°) =(90 - 30 +A)

2A+45° = 60 +A

A =60-45

A=15°

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