SOLUTION: Use half-angle identity to find the exact value of sin((5π)/(12)).

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Question 366650: Use half-angle identity to find the exact value of sin((5π)/(12)).
Answer by solver91311(24713) About Me  (Show Source):
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Half-angle formula for sin:



Hence:



Looking at the unit circle:



we see that

So:





Since sin is positive on and , take the positive root:




John

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