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Mathematics, 19.08.2019 23:30 shaelyn0920

Prove the identity
cos(a+b+c)=cosacosbcosc-cosasinbsin c-sinacosbcosc-sinasinbcosc

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Prove the identity
cos(a+b+c)=cosacosbcosc-cosasinbsin c-sinacosbcosc-sinasinbcosc...

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