Download Factor a trinomial: 2 cos 2x + cos x 1 = 0 when 0 ≤ x < 2π

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Transcript
PreCalc: Monday, 5‐1
5.5 day 3 Solving Trig Equations
Factor a trinomial: 2 cos 2x + cos x ­ 1 = 0 when 0 ≤ x < 2 π
Think of this equation as _______________ and use "X­box" method.
Solve using square roots:
4 sin 2x ­ 1 = 0 when 0 ≤ x < 2 π
Move all terms to one side of the equation and solve:
tan x sin 2x = 3 tan x when 0 ≤ x < 2 π