Show that sin 8 theta = 8 sin theta × cos theta × cos 2 theta × cos 4 theta
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show that sin 8 theta = 8 sin theta cos theta cos 2 theta cos 4 theta
Answer:
sin 8 theta = sin 2(4theta)
= 2into sin 4 theta . cos 4 theta
2 into 2 sin theta cos 2 theta = cos 4 thta
2 into 2 into 2 sin theta = cos theta cos 2 theta cos 4 theta
8 sin theta cos theta cos 2 theta cos 4 theta
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