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Prove that: s in 47^0+cos 77^0=cos 17^0...

Prove that: `s in 47^0+cos 77^0=cos 17^0`

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Prove that: sin 47^0+cos 77^0=cos 17^0

Prove that: s in47^(0)+cos77^(0)=cos17^(0)

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(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

(a) Prove that sin65^(@)+cos65^(@)=sqrt(2)cos 20^(@) (b) Prove that sin47^(@)+cos77^(@)=cos17^(@)

Prove that: cos 55^0+cos 65^0+cos 175^0=0