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cos40+cos80+cos160 +cos 240...

cos40+cos80+cos160 +cos 240

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cos40 + cos80 + cos160 + cos240

Show that cos20^o cos40^o cos60^o cos80^o =1/16

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

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

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

Prove that cos 20^@ cos 40^@ cos 60^@ cos 80^@=1/16 .

Prove that cos 20^@ cos 40^@ cos 60^@ cos 80^@=1/16 .

Prove the following : cos 20^@ cos 40^@ cos 60^@ cos 80^@ =1/16 .

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

Prove that: cos40^0cos80^0cos 160^0=\ -1/8