Wednesday

March 4, 2015

March 4, 2015

Posted by **Michael** on Wednesday, March 28, 2007 at 1:58pm.

do you know the formula

cos(A+b) = cosAcosB - sinAsinB

now compare it with your

cos 40 degrees cos 50 degrees minus sin 40 degrees sin 50 degrees

**Answer this Question**

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