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" 40."(sin72^(@)+cos78%" (sin "72^(@)-co...

" 40."(sin72^(@)+cos78%" (sin "72^(@)-cos18^(@))

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Evaluate the following : (sin72^(@)+cos18^(@))(sin72^(@)-cos18^(@))

Evaluate the following: (i) cos e c\ 31^@-sec59^@ (ii) (sin72^@+cos18^@)(sin72^@-cos18^@)

cos 6^(@) sin 24^(@) cos 72^(@) =

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) .

Find the value of the following: (cos47^(@)/sin43^(@))^(2)+(sin72^(@)/cos18^(@))^(2)-2cos^(2)45^(@)

Evaluate : (cos 75^(@))/ (sin 15^(@)) + (sin 12^(@))/ (cos 78^(@)) - (cos 18^(@))/ (sin 72^(@))

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