SOLUTION: Given that the exact value of sin pi/10 = -1+√5 divided by 4, for each question calculate the exact value of the expression. You may leave nested radicals in your answer, but
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Question 1125859: Given that the exact value of sin pi/10 = -1+√5 divided by 4, for each question calculate the exact value of the expression. You may leave nested radicals in your answer, but rationalize any denominaters.
sin pi/5
sin pi/20
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Given that the exact value of sin pi/10 = -1+√5 divided by 4, for each question calculate the exact value of the expression.
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For pi/5 use:
sin(2x) = 2sin(x)*cos(x)
As a check,
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For pi/20, use a half-angle formula.
The simplest is:
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To check:
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These can be tedious and error-prone.
There's no purpose in someone doing them for you.
Not much purpose in you doing them.
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