Question 1166011
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compute the given function value without a calculator.
theta =11pi/6 and cos(11pi/6)

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You could simply say,  "find the value of {{{cos(11pi/6)}}}, without using a calculator."


See on the unit circle,  {{{11pi/6}}} corresponds to {{{-pi/6}}}.  The sign of both those angles are the same (both are positive).  Already recognize that cosine of this/these is  {{{sqrt(3)/2}}}.