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If Cos X = -1/2, find the value of cos 3x.

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If Cos X = -1/2, find the value of cos 3x.

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Given: Cos X = \(\frac{-1}{2}\)

To find: cos 3x

We know that,

cos 3x = 4cos3x – 3 cosx

Putting the values, we get

cos3x = 1

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