If A is an acute angle and 2 cos 3 A -1- then the value of A -A- 60 degreesB- 45 degreesC- 30 degreesD- 20 degrees

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Trigonometric Ratios

If A is an ac...

Question

If A is an acute angle and 2 cos 3A = 1, then the value of A = ___.

60 degrees

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45 degrees

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30 degrees

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20 degrees

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