sin21^(@)cos9^(0)-cos84^(@)cos6^(@)

Prove that sin21^(@)cos9^(@)-cos84^(@)cos6^(@)=1/4 .

sin21^(@)cos9^(@)-cos84^(@) cos6^(@)=

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

The value of (sin24^(@)cos6^(@)-sin6^(@)sin66^(@))/(sin21^(@)cos39^(@)-cos51^(@)sin69^(@)) is

sin 21^(@) cos 9^(@) - cos 84^(@) cos 6^(@)=

cos12^(@)+cos60^(@)+cos84^(@)=cos24^(@)+cos48

cos12^(@)cos24^(@)cos48^(@)cos84^(@)

Evaluate the following: sin36^(@)cos9^(0)+cos36^(@)sin9^(0)

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

A=sin78^(@)-sin18^(@)+cos132^(@) B=cos12^(@)+cos84^(@)+cos132^(@)+cos156^(@) and C=(sin 75^(@)+sin 15^(@))/(cos 75^(@)+cos 15^(@)) then arrange in the ascending order