Quantitative Aptitude Trigonometry Trigonometric Ratios and Identities

0 < θ ≤ 90° అయితే, cos2 θ - 3 cos θ + 2 = 2 sin2θ అయినప్పుడు 'θ' విలువను కనుగొనండి?

1
30°
2
45°
3
90°
4
60°

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