That is a 60 degree reference angle because it is 60 degrees from 180. The exact value of is.

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### Therefore cos 2pi 3 1 2.

**Cos2pi 3**. The result can be shown in multiple forms. Compute answers using wolfram s breakthrough technology knowledgebase relied on by millions of students professionals. In this video we will learn to find the value of cos 2pi 3 the link of the video explaining the proof of the identity cos pi x cos x has been given bel.

Since our angle is greater than π 2 and less than or equal to π radians it is located in quadrant ii in the second quadrant the values for sin are positive only. Enter pi for π calculate cos 2π 3 determine quadrant. So you find cos 60degrees which is 1 2.

Make the expression negative because cosine is negative in the second quadrant. Cos 2pi 3 enter angle in degrees or radians enter angle or number for inverse functions. Make the expression negative because cosine is negative in the second quadrant.

Evaluate cos 2pi 3 apply the reference angle by finding the angle with equivalent trig values in the first quadrant. Find the exact value cos 2pi 3 apply the reference angle by finding the angle with equivalent trig values in the first quadrant. 120 degrees is in the 2nd quadrant and cos is positive there so the answer is 1 2.

Arccos the arccos function allows the calculation of the arc cosine of a number. The arccosine function is the inverse functions of the cosine function. The exact value of is.

1 decade ago 2pi 3 is equal to 120 degrees because 2pi 3 180 pi equals 2 60 which equals 120. For math science nutrition history. The result can be shown in multiple forms.

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