SOLUTION: Find the exact value of the trigonometric function at the given real number. (a) cos 11π/6= (b) cos(−11π/6) = (c) cos 17π/6 = Please exp

Algebra ->  Trigonometry-basics -> SOLUTION: Find the exact value of the trigonometric function at the given real number. (a) cos 11π/6= (b) cos(−11π/6) = (c) cos 17π/6 = Please exp      Log On


   

Question 920123: Find the exact value of the trigonometric function at the given real number.
(a) cos 11π/6=
(b) cos(−11π/6) =
(c) cos 17π/6 =
Please explain
Thank you
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
(a) cos 11π/6= √3/2
(b) cos(−11π/6) = √3/2 cos(-θ) = cos (θ)
(c) cos 17π/6 = cos (17π/6) = cos(5π/6 + 2π ) = cos(5π/6) = -√3/2
(cosx, sinx) Unit Circle Summary for Your reference
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