SOLUTION: How to do Identities problems in Trig. Like Cos^2(pi/6)?

SOLUTION: How to do Identities problems in Trig. Like Cos^2(pi/6)?

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Question 414084: How to do Identities problems in Trig. Like Cos^2(pi/6)?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
remember:

Also you must know that degrees....so
so, you will have

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