Express cos(5x) in terms of cos x

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#cos #cos5x #trigonometry
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Express cos(5x) in terms of cos x

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There is another method also : as we know,
Then, you develop and finally take the real part of the huge development (if you look, the cos(5x) was the real part of the expression, so the huge development real part has to be equal to cos(5x))

vatn
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Thank you so much this really save my life 😭😭

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