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" (ii) "sin78^(@)*cos18^(@)-cos78^(@)*si...

" (ii) "sin78^(@)*cos18^(@)-cos78^(@)*sin18^(@)=(sqrt(3))/(2)

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Evaluate the following: sin78^(@)cos18^(@)-cos78^(@)sin18^(0)

cos18^@-sin18^@=

3 cos72^(@)-4" sin"18^(@)=

cos18 ^ (@) - sin18 ^ (@) =

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) .

Evaluate : ((cos65^(@)sin18^(@)cos58^(@)))/((cos72^(@)sin25^(@)sin32^(@)))

cos72^(@)-sin18^(@)= ________

Prove that: sin^(2)42^(2)-cos^(2)78^(@)=(sqrt(5)+1)/(8)