IdentityHardQuestion 200041
Question
The value of sin 10° sin 50° sin 70° is:
- A1/8Correct
- B√3/8
- C1/4
- D1/16
Correct answer
1/8
Explanation
Use identity: sin θ sin(60°−θ) sin(60°+θ) = sin(3θ)/4. With θ = 10°: sin 10° sin 50° sin 70° = sin 30°/4 = (1/2)/4 = 1/8.