1 answer

2. You are required to write the product cos4u cos7u as a sum of two trigonometric...

Question:

2. You are required to write the product cos4u cos7u as a sum of two trigonometric functions. Use the identity cos A cos B =
2. You are required to write the product cos4u cos7u as a sum of two trigonometric functions. Use the identity cos A cos B = ][cos(A – B) + cos(A + B)] cos A cos B = { [cos(A – B) + cos(A + B)]to do so. In this given problem A = ? and B ? therefore cos4u cos7u =

Answers

Solution;;

from this formula

CosA.cosB = (cos(A – B) + cos(A + B)]

Compare to above formula

Cos4u.cosu cos7u.cos4u 5[cos(7u – 4u) + cos(7u +4u)Cos4u.costu = = [cos(7u – 4u) + cos(7u + 4u)Cos4u.costu = } [cos(3u) + cos(1lu)]

The value of Cos4u.costu = } [cos(3u) + cos(1lu)]

Where A=7u

B=4u

.

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