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Prove that: cos175^(@)+cos65^(@)+cos55...

Prove that:
`cos175^(@)+cos65^(@)+cos55^(@)=0`

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To prove that \( \cos 175^\circ + \cos 65^\circ + \cos 55^\circ = 0 \), we can follow these steps: ### Step 1: Group the cosines We start with the left-hand side (LHS): \[ \cos 175^\circ + \cos 65^\circ + \cos 55^\circ \] ...
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