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Prove that $4\sin\theta\,.\,\cos\theta\,.\,\cos 2\theta= \sin 4\theta$
in Grade 12 Maths by Bronze Status (5.9k points) | 23 views

1 Answer

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use double angle identity

=2(2sinx).cosx(1-2sinx^2)

=2(sin2x)(1-2sinx^2)

=2sinx-4sin2xsin^2x

=sin4x, proven
by Diamond (82.9k points)

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