cosx = - 1/3 , x in quadrant III. Find the value of sinx/2, cosx/2, tanx/2
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cos 2pi/3 cos pi/4 - sin 2pi/3 sin pi/4 = ?
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SOLVED: which of the following best explains why cos 2pi/3 is not equal to cos 5pi/3 A.The angles do not have the same reference angle. B.Cosine is negative in the second quadrant
For which of the quadrant angles 0, pi/2, pi , and 3pi/2 is the sine function equal to 0? | Homework.Study.com
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