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sin12^(@)cos42^(@)sin54^(@)=...

sin12^(@)cos42^(@)sin54^(@)=

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

Prove that: sin12^(@)sin48^(@)sin54^(@)=1/8

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

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

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) .

Prove that: sin12^(0)sin48^(0)sin54^(@)=(1)/(8)

Prove that (sin36^(@)+cos36^(@))/(cos54^(@)+sin54^(@))=1