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निम्न को सिद्ध कीजिए । cos6^(@) cos 42...

निम्न को सिद्ध कीजिए ।
`cos6^(@) cos 42^(@) cos 66^(@) cos 78^(@)=(1)/(16)`

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cos6^(@) cos42^(@) cos66^(@) cos78^(@) =

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

Prove that cos6^(@)*cos42^(@)*cos66^(@)cos78^(@)=(1)/(16)

4cos6^(@)cos42^(@)cos60^(@)cos78^(@)=

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

Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).

Prove that 4 cos 6^(@) cos 42 ^(@) cos 66^(@) cos 78^(@) = (1)/(4).