Find the sum of the series `cos e ctheta+cos e c2theta+cos e c4theta+ tont e r m sdot`

Find the sum of series co sec theta+co sec 2 theta+co sec 4 theta+....... to n terms

Solve cos theta+cos 2theta+cos 3theta=0 .

IF 11 theta = pi then cos theta . cos 2 theta . cos 3 theta cos 4 theta . Cos 5 theta is

If theta= (pi)/(6) , then the 10th term of the series 1+(cos theta +isin theta)+(cos theta +isin theta)^(2)+"……." is

Prove that cos 8 theta cos 2 theta = cos^(2) 5theta- sin^(2) 3 theta

Solve : 3-2 cos theta -4 sin theta - cos 2theta+sin 2theta=0 .

Prove: sin^4 theta - cos^4theta = 1 - 2cos^2 theta

The number of solution of sec^2theta+cos e c^2theta+2cos e c^2theta=8,0lt=thetalt=pi/2 is 4 (b) 3 (c) 0 (d) 2

If sin theta + cos theta theta = sqrt(2) cos theta then cos theta - sin theta is

The equation to the straight line passing through the point (acos^3theta,asin^3theta) and perpendicular to the line xsectheta+ycos e ctheta=a is (A) xcostheta-ysintheta=acos2theta (B) xcostheta+ysintheta=acos2theta (C) xsintheta+ycostheta=acos2theta (D) none of these