If cos 2θ = 0, where θ is an acute angle, then find the value of sin (75° - θ).
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Correct answer: B
Explanation
The correct answer is option 2 i.e. .
cos 2θ = 0
⇒ 2θ = 90° ⇒ θ = 45° (since θ is acute)
Now, sin(75° - θ) = sin(75° - 45°) = sin 30° = 1/2