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Which identity correctly shifts sine by a quarter turn?
Asin(x + π/2) = -cos x
Bsin(x + π/2) = cos x
Csin(x + π/2) = sin x
Dsin(x + π/2) = -sin x
Answer & Solution
Correct answer: B. sin(x + π/2) = cos x
Adding π/2 to the angle turns sine into cosine, sin(x + π/2) = cos x, and cosine into minus sine.
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