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[" (ii) "cos6^(@)cos42^(@)cos66^(@)cos78...

[" (ii) "cos6^(@)cos42^(@)cos66^(@)cos78^(@)=(1)/(16)],[" (iii) "cos36^(@)cos42^(@)cos60^(@)cos78^(@)=(1)/(16)]

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

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

cos20^(@).cos40^(@).cos60^(@).cos80^(@)=1/16

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

cos42^(@)+cos78^(@)+cos162^(@)=

Prove that cos20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)