S. T. cos60 = 1-2sin^30=2cos ^30-1
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here is your answer
cos 60=1/2
1-2sin²30=1-2×1/4=1-1/2=1/2
2cos²30-1=2×3/4-1=3/2-1=1/2
so,
cos60=1-2sin²30=2cos²30-1
I hope this answer will help you.
cos 60=1/2
1-2sin²30=1-2×1/4=1-1/2=1/2
2cos²30-1=2×3/4-1=3/2-1=1/2
so,
cos60=1-2sin²30=2cos²30-1
I hope this answer will help you.
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