COS 5 theta + COS 7 theta= ?
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Answer:
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cos 5 theta + cos 7 theta
=cos7 theta+ cos 5theta
=2cos (7 theta + 5 theta) × cos (7 theta - 5 theta)
2 2
=2cos(12 theta) × cos(2theta)
2 2
=2cos(6theta)cos theta