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" (vii) "cos10^(@)cos30^(@)cos50^(@)cos7...

" (vii) "cos10^(@)cos30^(@)cos50^(@)cos70^(@)=(3)/(16)

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cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =(3)/(16)

cos10^(0)cos30^(0)cos50^(@)cos70^(0)

Prove that cos10^(@)cos30^(@)cos50^(@)cos70^(@)=(3)/(16)

Prove that cos10^(@)cos30^(@)cos50^(@)cos70^(@)=(3)/(16)

Prove that: cos10^(0)cos30^(@)cos50^(@)cos70^(@)=(3)/(16)

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8

Prove that: i) cos10^(@)cos30^(@)cos50^(@)cos70^(@)=3/16 ii) cos20^(@)cos40^(@)cos60^(@)cos80^(@)=1/16 iii) 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@) iv) cos40^(@) cos80^(@)cos160^(@)=-1/8

cos 10^(@) cos 30^(@) cos 50^(@) cos 70^(@) =

Prove that cos10^@cos30^@cos50^@cos70^@=3/(16) .