if cos theta = 1 then cos 2theta
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8
Cos@=1
Cos2@=2Cos^2@-1
=2×1^2-1
1
Cos2@=2Cos^2@-1
=2×1^2-1
1
Answered by
5
cos {theta+theta}=cos theta * cos theta -sin theta* sin theta
cos theta =1 given
cos theta =cos 0 degrees
theta=0
cos theta +theta =cos 0 * cos 0 - sin 0 sin 0
=1 * 1-0 *0
=1-0
=1
cos theta =1 given
cos theta =cos 0 degrees
theta=0
cos theta +theta =cos 0 * cos 0 - sin 0 sin 0
=1 * 1-0 *0
=1-0
=1
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