cos^(2)theta+cos^(2)(60^(@)-theta)+cos^(2)(60^(@)+theta)=

cos theta - cos (60^(@) + theta ) - cos(60^(@) - theta )=

cos theta cos (60^(@) + theta ) * cos (60^(@) - theta ) =

Prove that 4 cos theta cos (60^(@) + theta) cos (60^(@) - theta) = cos 3theta .

Prove that: |cos theta cos(60^(@)-theta)cos(60^(@)+theta)<=(1)/(4) for all values of theta

Prove that cos thetacos(60^(@)- theta)cos(60^(@)+theta) = 1/4 cos 3 theta

The smallest positive angle theta (in degrees)satisfying the equation cos theta*cos(60^(@)-theta)*cos(60^(@)+theta)=(1)/(8) is equal to

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

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

What is (cos^(2)(45^(@)+theta)+cos^(2)(45^(@)-theta))/(tan(60^(@)+theta)tan(30^(@)-theta)) equal to ?

Prove that: sin(60^(@)-theta)cos(30^(@)+theta)+cos(60^(0)-theta)sin(30^(@)+theta)=1