If sin2 θ= 1/4, the general value of
2 n π ± (-1)n π/6
n π/2 ± (-1)'' π/6
n π± π/6
2 n π ± π/6
If √3 sec θ +2 = 0 , the general value of θ is
2 n π ± 2 π/3
2 n π ± π/3
2 n π ± 5 π/6
The value of cos (270o + θ) - sin (270o - θ) cos θ is.
0
-1
1/2
1
If Pn = cosnθ + sinn θ , then the value of 2P6 - 3P4 + 1 is.
2
3
If sin2x - 2 cosx+ 1/4=0, the general solution x is
2n π ± π/3
2 n π± π/4
n π ± π/3
If sin θ + cos θ =1 , the general value of θ is
2 n π
n π + (-1)n π/4 - π/4
2 n π+ π/2
n π+ π/2
If sin α = -3/5, where < α < 3/2, then the value of cos α/2 is.
Cos 134o = ___________
-0.6947
0.7947
-0.6375
0.2945
Cos (-17600) =
-0.7660
0.7660
