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Show that (a) sin4 u = 1 8 [cos 4u 4 cos 2u + 3] (b) sin5 u = 1 16 [sin 5u 5 sin

Show that (a) sin4 u = 1 8 [cos 4u 4 cos 2u + 3] (b) sin5 u = 1 16 [sin 5u 5 sin 3u + 10 sin u] (c) cos6 u = 1 32 [cos 6u + 6 cos 4u + 15 cos 2u + 10] (d) cos2 u sin3 u = 1 16 [2 sin u + sin 3u sin 5u]

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