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Skriva $cos^{2} (v) - sin^{2} (v)$ som cosinus för dubbla vinkeln

Cosinus för dubbla vinkeln,

cos (2 v),

kan skrivas som

cos^{2} (v) - sin^{2} (v),

oavsett värde på vinkeln v. Man kan även använda det här sambandet baklänges:

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