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Answer:

x = 10°.

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Step-by-step explanation:

Given,

2 cos 3x -1 = 0.

2 cos 3x = 1.

cos 3x = 1/2.

cos 3x = cos 60°.

3x = 60°. (Comparing cos).

:: x = 10°.

Answer:

Step-by-step explanation:

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