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January 31, 2015

January 31, 2015

Posted by **Carol** on Monday, April 25, 2011 at 9:06pm.

- Trigonometry -
**drwls**, Monday, April 25, 2011 at 9:39pmcos (A-B) = cosA cosB - sinA sinB

Note that cosA = 4/5 and sin B = 7/25, which you can prove using

cos^2 x + sin^2 x = 1

- Trigonometry -
**Anonymous**, Thursday, June 7, 2012 at 7:30pm117/125

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