sin 60=2sin30 s cos30
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sin 60 = √3/2
sin 30 = 1/2
cos 30 = √3/2
sin 60 = 2sin 30 cos30
√3/2 = 2(1/2×√3/2)
√3/2 = 2×√3/4
√3/2 = √3/2
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