Convert −sin(6t) to cos(6t+90°). The two cosine phases differ by thirty degrees, or π/6 radians, at common angular frequency six rad/s. Hence the nearest peak separation is Δt=(π/6)/6=π/36=10π/360 s. This calculation gives B, whereas the published key is C=50π/360; C corresponds to the complementary phase selection of one hundred fifty degrees. The official grading is retained and this discrepancy is identified.
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