SOLUTION: please help me with my homework: using exact values, verify that cos 60 degrees = 1 - 2 sin^2 30 degrees.
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Question 87036: please help me with my homework: using exact values, verify that cos 60 degrees = 1 - 2 sin^2 30 degrees. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! verify that cos 60 degrees = 1 - 2 sin^2 30 degrees.
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cos 60 = 1/2
sin 30 = 1/2
Your Problem:
1/2 = 1 - 2(1/2)^2
1/2 = 1 - 2*(1/4)
1/2 = 1 - 1/2
1/2 = 1/2
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Cheers,
Stan H.
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