Trigonometry Identities I Introduction - Math Plane
2 sin sm 30 or 2) y = cos2x and y = cosx+2 (Set equations equal to each other) cos2x — cosx + 2 o Substitution (Double Angle Identity) Set equation equal to zero Re-arrange the polynomial F actor Solve 2cos x 2cos x 2cos x (2cosx 2cosx cosx 1 — cosx + 2 1 — cosx 2 cosx — 3 — 0 3)(cosx + 1) 0 1 cosx+ 1 0 cosx No Solution! (cost 1) COST ... ................
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