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:.(sin9^(0)*cos9^(0))/(sin48^(@)sin12^(@...

:.(sin9^(0)*cos9^(0))/(sin48^(@)sin12^(@))=

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(sin9^(@)-cos9^(@))/(sin48^(@)sin 12^(@))=

value of (sin9^(@)cos9^(@))/(sin48^(@)sin12^(@)) is equal to :

sin 48^(@) * sin 12^(@) =

sin12^(0)sin48^(@)sin54^(@)=

sin12^(@)sin48^(@)sin54^(@)=

(cos9^(@)+sin9^(@))/(cos9^(@)-sin9^(@))=?

sin9^(@)+cos9^(@)=sqrt(2)sin54^(@)

cos9^(@)-sin9^(@)=

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0