If `: cos 6 theta + cos 4 theta + cos 2 theta + 1 = 0`,
where, `0 lt theta lt 180^(@)`, then : `theta` =

1+cos2 theta+cos4 theta+cos6 theta=

If (cos^(2) theta)/(cot^(2) theta - cos^(2) theta) = 3 and 0^(@) lt theta lt 90^(@) , then the value of theta is

If sin theta = sqrt(3) cos theta, 0 lt theta lt 90^(@) , then theta is equal to .

Solve 5 cos 2 theta+2 "cos"^(2) theta/2 +1=0, -pi lt theta lt pi .

If (1/(1+cosec theta ) - 1/(1-cosec theta ))cos theta= 2 , 0^circ lt theta lt 90^circ , then the value of sin^(2) theta + cot^(2) theta + sec^(2) theta is: यदि (1/(1+cosec theta ) - 1/(1-cosec theta ))cos theta= 2 , 0^circ lt theta lt 90^circ , है,तो sin^(2) theta + cot^(2) theta + sec^(2) theta का मान हैः