When sin x = -8/17 and lies in quadrant 3 and cos y = -4/5 and lies in quadrant 2, find cos (x - y).

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- January 4th 2009, 01:02 PM #1

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- January 4th 2009, 01:29 PM #2

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- January 5th 2009, 10:01 PM #3

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- January 5th 2009, 10:16 PM #4

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- January 6th 2009, 06:18 AM #5

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