Trigonometry Identities I Introduction
— cosx + 2 1) 2) - cos2 e — cos2x and Y and Y sin — cosx + 2 1/2 SOLUTIONS cos2S and y = sine (To find solutions, set equations equal to each other) 1 1 2sin cos2 2 sin sm sm sm 150 Substitution (Double Angle Identity) Set equation equal to zero Re-arrange the polynomial F actor Solve sm sm 270 2Sin Sin l)(sin (2 Sin 2 sin sm 30 or ................
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