1+cos56^(@)+cos58^(@)-cos66^(@)=

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Show that 1+cos 56^(@)+ cos 58^(@)-cos66^(@)=4 cos 28^(@) cos 29^(@) sin 33^(@)

(1+cos 56^(@)+cos58^(@)-cos66^(@))/(cos28^(@)cos29^(@)sin33^(@))=kcos(A/2)cos(B/2)sin(c/2) then k=?

cos56^(@)+cos58^(@)-cos66^(@)-4cos28^(@)cos29^(@)sin33^(@)=

If 1+cos56^(0)+cos58^(0)-cos66^(0)=k cos28^(0)cos29^(@)sin33^(@) then the value of k is

(1+ cos 56^(@) + cos 58^(@) - cos 66^(@))/( cos 28^(@) cos 29^@ sin 33^(@) )=

1+ cso 56^(@) + cos 58^(@) - cos 66^(@)=

If cos56^(0)+cos58^(0)-cos66^(0)-4cos28^(0)-cos29^(@)sin33^(@)=lambda then |2 lambda|=

Prove that cos 6^(@) cos 42^(@) cos 66^(@) cos 78^(@) =(1)/(16)