यदि ` 2cos theta =x +(1)/(x) ` सिद्ध कीजिए की ` 2cos 3theta =x^(3) +(1)/( x^(3)) `

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If 2 cos theta = x + (1)/(x), prove that 2 cos 3 theta = x ^(3) + (1)/(x ^(3)).

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