Show that , (a) sin0 [cos 40 - 4 cos 20 + 3] (b)sin0 = [sin 50

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Show that ,

(a) sin0 [cos 40 - 4 cos 20 + 3] (b) sin0 = [sin 50  5 sin 30 + 10 sin 0] (c) cos 0 = 3/2 [cos 60 + 6 cos 40

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