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" (i) "sin65^(@)+cos65^(@)=sqrt(2)cos20^...

" (i) "sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)

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Prove that, sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)

(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: sin65^(@)+cos65^(0)=sqrt(2)cos20^(@)

2sin65^@cos25^@=

cos 25^(@) - cos65^(@) =

sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

sin25^(@)cos65^(@)+cos25^(@)sin65^(@)

Prove that: sin 65^0+cos 65^0=sqrt(2)cos 20^0