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8cos20^(@)cos40^(@)cos80^(@)=1...

`8cos20^(@)cos40^(@)cos80^(@)=1`

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Prove that: cos20^(@)cos40^(@)cos80^(@)=(1)/(8)

Prove that: cos20^(@)cos40^(@)cos80^(@)=1/8

Prove that : cos20^(@)cos40^(@)cos80^(@)=1/8

Prove that: cos20^(@)cos40^(@)cos80^(@)=1/8

Prove that a) (sin3A + sinA)sinA+(cos3A-cosA) cosA=0 b) cos20^(@)cos40^(@)cos80^(@)=1/8

Prove that a) (sin3A + sinA)sinA+(cos3A-cosA) cosA=0 b) cos20^(@)cos40^(@)cos80^(@)=1/8 c) (sin8thetacostheta-sin6thetacos3theta)/(cos2thetacostheta-sin3thetasin4theta) = tan2theta

Prove that cos20^(@) cos40^(@) cos80^(@) = 1/8

if sin2A=2sin A cos A and sin20^(@)=K then the value of cos20^(@)cos40^(@)cos80^(@)cos160^(@)-

Prove that cos 20^(@) cos 40^(@) cos 80^(@)=1/8

Prove that cos 20^(@) cos 40^(@) cos 80^(@)=1/8