If 2sin 3A - 1 = 0 ; the value of angle A is : 1. 20° 2. 60° 3. 10° 4. 30°

2sin 3A - 1 = 0 ⇒ 2sin 3A = 1 ⇒ sin 3A = ⇒ sin 3A = sin 30° So, 3A = 30° ⇒ A = ⇒ A = 10° Hence, option 3 is the correct option.

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Mathematics

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2sin 3A - 1 = 0

⇒ 2sin 3A = 1

⇒ sin 3A = $\dfrac{1}{2}$

⇒ sin 3A = sin 30°

So, 3A = 30°

⇒ A = $\dfrac{30°}{3}$

⇒ A = 10°

Hence, option 3 is the correct option.

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