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Solve: 2 cos^2 θ + 3 sin θ = 0

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Solve: 2 cos2 θ + 3 sin θ = 0

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2 cos2 θ + 3 sin θ = 0 

⇒ 2 (1 – sin2 θ) + 3 sin θ = 0 

⇒ 2 – 2 sin2 θ + 3 sin θ = 0 

⇒ -2 sin2 θ + 3 sin θ + 2 = 0 

⇒ 2 sin2 θ – 3 sin θ – 2 = 0 

⇒ (2 sin θ + 1)(sin θ – 2) = 0

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