Question

i) sin(30°+A) + sin(30°-A) =​

Answer 1

Answer:

sin (A + B ) formula use....

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Answer 2

Answer:

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The answer is Cos(A)

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$sin(30°+A) + sin(30°-A) \\ \\ = > \sin(30 ) \cos(a) + \cos(30) \sin(a) + \sin(30) \cos(a) - \cos(30) \sin(a) \\ \\ 2sin(30 ) \cos(a) \\ \\ 2 \times \frac{1}{2} cos(a) = cos(a) \: \: \: \: \: \: \: \: answer$