Let sin 2θ = cos 3θ, where θ is acute angle. What is the value of 1 + 4 sin θ ? (given that sin 18° = √(5 - 1)/4) - NDA Mathematics 2022 (I)

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Let sin 2θ = cos 3θ, where θ is acute angle. What is the value of 1 + 4 sin θ ? (given that sin 18° = √(5 – 1)/4)