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" कि (Prove that) "sin65^(@)+cos65^(@)=s...

" कि (Prove that) "sin65^(@)+cos65^(@)=sqrt(2)cos20^(@)" ."

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Prove that: sin65^(@)+cos65^(0)=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: sin 65^0+cos 65^0=sqrt(2)cos 20^0

Prove that cos65^(@)+cos115^(0)=0

2sin65^@cos25^@=

Prove that sin85^(@) - cos65^(@) +cos55^(@)=0

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

Prove that cos65^0+cos115^0=0