`cos48^@.cos12^@=`

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Prove that 4cos12^(@)cos48^(@)cos72^(@)=cos36^(@)

The value of cos12^(@)cos24^(@)cos36^(@)cos48^(@)cos72^(@)cos84^(@), is

The value of cos24^(@)-cos12^(@)+cos48^(@)-cos84^(@), is not greater than

" The exact value of "2(cos24^(@)-cos12^(@)+cos48^(@)-cos84^(@))" is "

Find the value of cos 12^@*cos 24^@*cos 36^@*cos 48^@*cos 72^@*cos96^@

cos48^(@)cos23^(@)cos ec42^(@)cos ec67^(@)=1

If cos48^(0)*cos12^(@)=(sqrt(5)+3)/(lambda) then lambda

cos48^(0)*cos12^(0)=(sqrt(5)+3)/(lambda) .Then lambda=

cos48^(0)*cos12^(0)=(sqrt(5)+3)/(lambda) then lambda=

cos12^(@)+cos60^(@)+cos84^(@)=cos24^(@)+cos48