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4 November, 05:13

sin x = - 1/2, and the cos y = √3/2. if angle x is in the fourth quadrant and angle y is in the first quadrant, the value of cos (x-y) is

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  1. 4 November, 05:27
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    X is 11pi/6 and y is pi/6. So cos (10pi/6) = cos (5pi/3) = 1/2. 1/2 is the answer
  2. 4 November, 05:30
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    More info
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