Sole the equation sin^{2}θ - cos^{2}θ = - ½ for 0°≤ θ ≤ 360°

sin^{2}θ − cos^{2}θ = − 1 2but sin^{2}θ + cos^{2}θ = 11 − 2cos^{2}θ = −0.52cos^{2}θ = 1.5cos θ= ±0.8666θ = 30 & 330 or 150 & 210

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