3. Determine the value of sin 56° to four decimal places.

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A: Given θ lies in fourth quadrant.  cos θ = 40/41

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A: Sin (2x)=2sin(x)cos(x) Cos(2x)=cos²x-sin²x Sin(x/2)=[(1-cosx)/2]½. Cos(x/2)=[(1+cosx)/2]½

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