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November 24, 2014

November 24, 2014

Posted by **Rox** on Wednesday, February 13, 2013 at 9:47am.

- maths -
**Reiny**, Wednesday, February 13, 2013 at 11:14amcos 2Ø = 1 - 2sin^2 Ø

= 1 - 2(1/15) = 1 - 2/15 = 13/15 = a/b

and since a/b is in lowest terms

a = 13, b=15

so a+b = 28

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