Find the value of 'A', if 2cos 3A = 1

योग

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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अध्याय 22: Trigonometrical Ratios of Standard Angles - Exercise 27.1

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