The minimum value of 5 sin 2 θ + 4 cos 2 θ is
1
2
3
4
Cos4 A- sin4A=
(cos2A-sin2A)2
(cos2A+ sin2A)
1-2 sin2A
1-2 cos2A
1 - cos2θ - sin2θ =
0
____________=1+tan2θ
cos2θ
sec2θ
cosec2θ
cot2θ
If A, B, C, D are the angle of a cyclic quadrailater at, then cos A + cos B + cos C+ cos D is equal to
2 (cos A + cos C)
2 (cos A + Cos B)
2 (cos A + cos D)
Cos (-17600) =
-0.7660
0.7660
If √3 sec θ +2 = 0 , the general value of θ is
2 n π ± 2 π/3
2 n π ± π/6
2 n π ± π/3
2 n π ± 5 π/6
The value of cos 1o cos 2o cos 3o .... cos 100o =
-b
None of these
If sec2 θ = 4/3, the general value of θ is
n π ± π/6
n π ± π/3
If θ = 30o find the value of sin2θ + cos2θ
