SOLUTION: Find the exact value by using a half-angle identity. (4 points)
cos(5pi/12)
Here is my work, can someone please check to see if I did it right?
cos ((5 pi/6)/2) = +/- sqrt(
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Question 979506: Find the exact value by using a half-angle identity. (4 points)
cos(5pi/12)
Here is my work, can someone please check to see if I did it right?
cos ((5 pi/6)/2) = +/- sqrt( (1+cos (5 pi/6))/2 )
cos(5 pi/6) = -sqrt(3)/2
cos (5 pi/12) = +/- sqrt( (2/2-sqrt(3)/2)/2 )
cos (5 pi/12) = +/- sqrt( ((2-sqrt(3))/2)/2 )
cos (5 pi/12) = sqrt( ( (2-sqrt(3))/4 ) )
Answer by ikleyn(52799) (Show Source): You can put this solution on YOUR website!
Find the exact value by using a half-angle identity. (4 points)
.
Here is my work, can someone please check to see if I did it right?
= +/- correct
= correct
= +/- correct
= +/- correct
= correct
EVERYTHING IS CORRECT.
==========================
You can write the last expression as
= .
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