# Trigonometric Identities : Calculate cos(3u) in terms of cos(u).

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Calculate cos(3u) in terms of cos(u).

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#### Solution Preview

cos(2u+u)=

cos(2u+u) =

cos(2u)cos(u)-sin(2u)sin(u) ...

#### Solution Summary

Cos(3u) is calculated in terms of cos(u).

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