If cos (θ + 31°) = sin 47°, then what is the value of sin 5θ?

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A½

B1/√2

C√3/2

Answer:

cos (θ + 31°) = sin 47° cos (θ + 31°) = sin (90 - 43)° cos (θ + 31°) = cos 43° θ = 12° Sin 5θ = sin 60° = √3/2

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