If sin θ = √3 cos θ, - π < θ
- 5 π/6
- 4π/6
4π/6
5π/6
If cos θ = 1/2 ( a+1/a), then the value of cos 3 θ is.
1/8 (a3 + 1/a3)
3/2 (a + 1/a)
1/2 (a3 + 1/a3)
1/3 (a3 + 1/a3)
Sinθ*cosecθ = ____________
1
0
180
none
If cos θ = -1/2 and 0 < θ < 360o, then the values of θ are.
120o and 300o
60o and 120o
120o and 240o
60o and 240o
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
Sin 115o = ___________
0.9063
0.8063
0.7063
0.6063
sin 120o = __________
1/2
1/√2
3/2
None
(1+ tanA)2 + (1-tanA)2 =
sec2A
secA
2sec2A
If sin 5 x + sin 3 x + sin x =0, beside 0, in 0 ≤ x ≤ π/2 the value of x is
π/6
π/12
π/3
π/4
Cos (-17600) =
-0.7660
0.7660
