($9) 1 13 The unit circle shown to the right has been divided into twelve equal

Question

($9) 1 13 The unit circle shown to the right has been divided into twelve equal arcs, corresponding to t-values of 0, , 6' 3' 23'6 trigonometric function at the indicated real number, t, or state that the expression is undefined %,6.3 2 36 and 2x Use the (xy) coordinates in the figure to find the value of the (44) COS Select the correct choice below and, if necessary, fill in the answer box to complete your choice (Type an exact answer, using radicals as needed. Use integers or fractions for any numbers in the expression.) B. The expression is undefined

Explanation / Answer

cos(pi/6) = y/sqrt(x2+y2) = sqrt(3)/2/(sqrt 4 /2) = sqrt(3)/2

Thereforer cos (pi/6)= sqrt(3)/2

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