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Use the product-to-sum formulas to write the product as a sum or difference.

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Use the product-to-sum formulas to write the product as a sum or difference.

10 cos 75^o cos 15^o

product-sum-formulas
trignometric-functions

asked Jan 22, 2015 in TRIGONOMETRY by anonymous

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1 Answer

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Step 1:

The trigonometric expression is .

Using the product-to-sum formula : .

.

Solution :

.

answered Jan 23, 2015 by joseph Apprentice

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