cos 5 theta+cos 7 theta=
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Step-by-step explanation:
cos 5 theta+cos 7 theta
=cos7 theta+ cos 5theta
=2cos (7 theta + 5 theta)/2 * cos (7 theta - 5 theta)/2
=2cos(12 theta)/2 * cos(2theta)/2
=2cos(6theta)costheta
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