if sin (a) =40/41, and a lies in quadrant 1

and sin b = 40/41 and lies in quadrant II

what is the exact value of cos(a+b)?

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- Nov 13th 2009, 06:28 PM #1

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- Nov 13th 2009, 06:32 PM #2

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- Nov 13th 2009, 06:35 PM #3

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- Nov 13th 2009, 06:42 PM #4

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- Nov 13th 2009, 06:50 PM #5