SOLUTION: Express as a product
cosa+2cos7a+cos13a
I know formulas but not how to apply
Algebra.Com
Question 1126039: Express as a product
cosa+2cos7a+cos13a
I know formulas but not how to apply
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Express as a product
cosa+2cos7a+cos13a = (1/4)*(4cosa + 8cos7a + 4cos13a)
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