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प्रश्न
Find the value of 'A', if 2cos 3A = 1
योग
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उत्तर
2cos 3A = 1
⇒ cos 3A = `(1)/(2)`
⇒ cos 3A = cos60°
⇒ 3A = 60°
⇒ A = 20°.
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Trigonometric Equation Problem and Solution
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