## Answers

Solution;;

from this formula

Compare to above formula

The value of

Where A=7u

B=4u

CosA.cosB = (cos(A – B) + cos(A + B)]

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)]

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

.
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