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" (viii) "sin51^(@)+cos81^(@)=cos21^(@)...

" (viii) "sin51^(@)+cos81^(@)=cos21^(@)

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"sin" 51^(@)+cos 81^(@)=cos 21^(@) .

Prove that: "sin"51^(@)+cos81^(@)=cos21^(@) .

Prove that, sin51^(@)+cos81^(@)=cos21^(@)

Prove that sin51^(@)+cos81^(@)=cos21^(@) .

Prove that :sin51^(0)+cos81^(0)=cos21^(0)

Prove the following identities : 4 sin 23^(@) sin37^(@) sin 83^(@) = cos21^(@)

Value of (2sin9^(@)sin 21^(@)sin 39^(@)sin 51^(@)cos21^(@)sin 81^(@))/(sin54^(@)) is equal to:-

Value of (2sin9^(@)sin 21^(@)sin 39^(@)sin 51^(@)cos21^(@)sin 81^(@))/(sin54^(@)) is equal to:-

Prove the following : sin 51^@ + cos 81^@ = cos 21^@ .

(The24^(@)cos6^(@)-sin6^(@)sin66^(@))/(sin21^(@)cos39^(@)-cos51^(@)sin69^(@)) is