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[" 13.The value of "cos20^(@)cos40^(@)*c...

[" 13.The value of "cos20^(@)cos40^(@)*cos60^(@)*cos80],[[" 10: "," (b) "1/16],[" (a) "3/8," (d) "3/16],[" (c) "1/8," (d) "]]

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The value of cos40^(@)+cos80^(@)+cos160^(@) is

cos 20^(@) cos 40^(@) cos 80^(@)=

cos20^(@).cos40^(@).cos60^(@).cos80^(@) is :

cos20^@cos40^@cos80^@=

Find the value of 8 cos10^(@)cos20^(@)cos40^(@) .

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

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

The value of cos20^@cos40^@cos60^@cos80^@ is equal to

Find the value of cos 20^@ cos 40^@ cos 80^@

The value of cos 20^(@) cos 40^(@)cos 60^(@) cos 80^(@) is equal to