" What was "80^(@)" cus "160^(@)=-(1)/(8)

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

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

cos 40^(@) + cos 80^(@) + cos 160^(@) =

sin 40^(@) - sin 80^(@)+ sin 160^(@) =

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

Sin40^(@) - Sin80^(@) + Sin160^(@) =

Cos 40^(@) + Cos80^(@) + Cos160^(@) + Cos240^(@) =

If O be the centre, find the value of angleBAC . Options are (a) 80^@ (b) 160^@ (c) 40^@ (d) 20^@

If sin2A=2sinA cosAand sin20^(@)=K, " then the value of " cos20^(@)cos80^(@)cos160^(@) =__________.