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Posted by **Don** on Tuesday, December 27, 2011 at 6:37pm.

a. cos70

b. sin70

c. cos 20

d. sin 20

which answer is correct ?

- Trig -
**Damon**, Tuesday, December 27, 2011 at 6:43pmcos a cos b - sin a sin b = cos(a+b)

= cos 70

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