[cos20^(@)*cos40^(@)*cos t0^(@)*cos80^(@...

[cos20^(@)cos40^(@)cos t0^(@)cos80^(@)sqrt(41-1)],[sin(1)/(16)(b)(1)/(9)(0)(1)/(2)quad (d)quad 8quad (e)1t]

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

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

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

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

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

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

Prove that cos 20^(@)cos40^(@)cos60^(@)cos80^(@)=(1)/(16)

Prove that: cos20^(@)cos40^(@)cos80^(@)=1/8

Prove that: cos20^(@)cos40^(@)cos80^(@)=1/8

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