4cos6 theta cos4 theta cos2 theta=

4 cos 6 theta cos 4 theta cos 2 theta =

Prove the following : cos 7 theta + cos 5 theta + cos 3 theta +cos theta =4 cos theta cos2 theta cos4 theta for all value of theta .

cos 3theta+cos 5theta+cos 7theta+cos 9theta=4 cos theta cos 2theta cos 6theta .

cos theta cos2 theta cos3 theta=(1)/(4)

Find the values of theta betwen 0^(@) and 180^(@) satisying the equation cos6 theta+cos4 theta+cos2 theta+1=0

Solve for theta,theta in[0,pi],cos theta cos2 theta cos3 theta=(1)/(4)

8sin theta cos theta cos2 theta cos4 theta=sin x rArr x=

8sin theta cos theta cos2 theta cos4 theta=sin x the x=

1+cos2 theta+cos4 theta+cos6 theta=

Prove that: (cos6 theta+6cos4 theta+15cos2 theta+10)/(cos5 theta+5cos3 theta+10cos theta)=2cos theta