sinθ + cosθ = √2/3sinθ= √2/3 - cosθ sin^2θ= 2/9 - 2√2/3 cosθ + cos^2θ1-cos^2θ= 2/9 - 2√2/3 cosθ + cos^2θ2cos^2θ - 2√2/3 cosθ - 7/9 = 0(√2cosθ+1/3)(√2cosθ-7/3) = 00