The general solution of sinx - 3 sin 2x+ sin 3x= cosx -3 cos2x + cos 3 x is
n π+ π/8
n π/2+ π/8
(-1)n(nπ/2)+π/8
2nπ+cos-1 (3/2)
If for real values of x, cos θ = x + 1/x, then.
θ is an acute angle
θ is a right angle
θ is an obtuse amgle
No value of θ is possible
The value of cos 1o + cos 2o + cos 3o + ... + cos 180o is.
-1
0
1
2
1 - cos2θ - sin2θ = ___________
3
1/2
√3
The general value of θ which satisfies tan θ = -1 and cos θ = 1/√2 the equations is
n π + 7 π/4
n π + (-1)n 7π/4
2 n π + 7 π/4
If sin θ = √3 cos θ, - π < θ
- 5 π/6
- 4π/6
4π/6
5π/6
If sec2 θ = 4/3, the general value of θ is
2 n π ± π/6
n π ± π/6
2 n π ± π/3
n π ± π/3
The value of cos2 α + cos 2 (α + 120o) + cos2 (α - 120o) is.
3/2
Sin90o = ______________
∝
none
