cos40+cos80+cos160 +cos 240

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cos40 + cos80 + cos160 + cos240

cos 40^0+cos 80^0+cos 160^0+cos 240^0= 0 b. 1 c. 1//2 d. -1//2

cos40^(@)+cos 80^(@)+cos160^(@)+cos240^(@) =

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

What is cos80^@ + cos 40^@ - cos20^@ equal to ?

Prove that cos 20^@ cos 40^@ cos60^@ cos80^@=1/16

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

Prove that: cos40^(@)cos80^(@)cos160^(@)=-(1)/(8)

cos20 ^ (@). cos40 ^ (@). cos60 ^ (@) cos80 ^ (@) =

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