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प्रश्न
Find A, if 0° ≤ A ≤ 90° and sin 3A – 1 = 0
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उत्तर
sin 3A – 1 = 0
`=>` sin 3A = 1
We know sin 90° = 1
∴ 3A = 90°
Hence, A = 30°
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