c) Check that the sum of the angles is 180o. sin3x = 3sinx 4sin3x x2 sin--
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c) Check that the sum of the angles is 180o.
sin3x = 3sinx – 4sin3x x2 sin-- 1 – cosx 2
= --------------------
x 7 20
= -----π
tan3x 3tanx tan x – 3 1 – 3tan2x
= ---------------------------------
x2 tan-- sinx 1 + cosx
= --------------------
x = 27°
α β sin sin 12
= --[ cos(α – β) – cos(α + β)]
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