Fumiko860 Fumiko860

22-07-2014
Mathematics

Answered

what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.

Verified Answer :

Anonymous Anonymous

24-07-2014

\(cos 2x=1-2sin^2x \\ cos 45^0=1-2sin^2(22,5)^0 \\ \frac{ \sqrt{2} }{2} =1-2sin^2(22,5)^0 \to sin(22,5)^0= \frac{ \sqrt{2- \sqrt{2} } }{2}\)

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