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Damm [24]
3 years ago
14

Verify the identities.

Mathematics
1 answer:
sasho [114]3 years ago
4 0
cos(4u)=cos(2u+2u) \\ =cos(2u)cos(2u) - sin(2u)sin(2u) \\ = cos^{2} (2u)- sin^{2} (2u)
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