Hi How can these be expressed as the other? So, waht is the relationship, in terms of identities, of cos4A to cos2A? Thanks
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Originally Posted by 200001 Hi How can these be expressed as the other? So, waht is the relationship, in terms of identities, of cos4A to cos2A? Thanks $\displaystyle \cos (4a) = \cos (2a + 2a)$. $\displaystyle \cos 2a$ is double angle and there are identities for that.
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