Trigonometric Equations. In quadratic form, using identities or linear in sine and cosine. Solving a Trig Equation in Quadratic Form. Solve the equation: 2sin 2 θ – 3 sin θ + 1 = 0, 0 ≤ θ ≤ 2 p Let sin θ equal some variable sin θ = a Factor this equation (2a – 1) (a – 1) = 0
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In quadratic form, using identities or linear in sine and cosine
2q = 7p/2
q = 7p/4