`cos20^@cos40^@cos60^@cos80^@-1/16=`

cos20^@cos40^@cos80^@=

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

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

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 that: cos20^0cos40^0cos60^0cos80^0=1/(16)

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

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

cos 20^@.cos 40^@.cos 60^@ cos 80^@= a) 1/16 b) 3/16 c) sqrt3/16 d) sqrt3/32

Statement-1: The vlaue of cos20^(@)cos40^(@)cos60^(@)cos80^(@)is1/16. Statement-2: for any theta, cos thetacos(60^(@)-theta)cos(60^(@)+theta)=1/4cos3theta