[2cos^(2)theta-2sin^(2)theta=1," then "theta=],[[" (a) "15^(@)," (b) "30^(@)," (c) "45^(@)," (d) "60^(@)]]

2cos^2theta-2sin^2theta=1 then theta =

2 cos ^(2) theta - 2 sin ^(2) theta =1, then theta =

If 2cos^(2)theta-2sin^(2)theta=1, then theta equals to

If 2cos^(2)theta-2sin^(2)theta=1, then theta is equal to

If 2 cos ^(2) theta - 2 sin ^(2) theta =1, then theta = ............. A) 15^(@) B) 30^(@) C) 45^(@) D) 60^(@)

cos theta+sin theta=cos2 theta+sin2 theta

A value of theta in (0, pi//3), for which |{:(1+"cos"^(2)theta, "sin"^(2)theta, 4"cos" 6 theta), ("cos"^(2)theta, 1+"sin"^(2)theta, 4"cos"6theta), ("cos"^(2)theta, "sin"^(2)theta, 1+4"cos"6theta):}| = 0, is

(cos theta + sin theta )^(2) + (cos theta - sin theta )^(2) =

2(cos theta+cos2 theta)+(1+2cos theta)sin2 theta=2sin theta

(cos theta + sin theta) ^ (2) + (cos theta-sin theta) ^ (2) =