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How do I find the value of cos 5pi / 6?

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Nov 8, 2016

Answer:

Find exact value of #cos ((5pi)/6)#

Ans: #sqrt3/2#

Explanation:

On the trig unit circle,
#cos ((5pi)/6) = cos (- pi/6 + pi) = - cos (pi/6)#
Trig Table of Special Arcs gives -->
#cos ((5pi)/6) = - cos (pi/6) = - sqrt3/2#

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