cos(2*pi/3) = You must write your answers as rational numbers or as the rational

Question

cos(2*pi/3) = You must write your answers as rational numbers or as the rational multiple of a sqrt() of a rational number. You must enter a half as 1/2 and not 0.5. If the answer to a problem is undefined (for example, tan(90 degree )=1/0 is undefined), enter Und. cos(11*pi/6) = You must write your answers as rational numbers or as the rational multiple of a sqrt() of a rational number. You must enter a half as 1/2 and not 0.5. If the answer to a problem is undefined (for example, tan(90 degree )=1/0 is undefined), enter Und.

Explanation / Answer

cos (2pi/3) = - 1/2

cos (11pi/3) = cos (4pi-pi/3) = cos (pi/3) =  1/2

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