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sin78^(@)-sin66^(@)-sin42^(@)+sin6^(@)...

sin78^(@)-sin66^(@)-sin42^(@)+sin6^(@)

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Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

Prove that sin 12^(@) sin18^(@)sin42^(@) sin48^(@) sin 72^(@) sin78^(@)=(cos18^(@))/(32) .

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

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

cos66^(@)+sin84^(@)=

cos66^(@)+sin84^(@)=

The value of sin 78^@ - sin 66^@ - sin 42^@ + sin 6^@ is

The value of sin 78^@ - sin 66^@ - sin 42^@ + sin 6^@ is