If cos θ = 1/2 (x + 1/x), then 1/2 (x2 + 1/x2) is equal to
sin 2 θ
cos 2 θ
tan 2 θ
sec2 θ
If tan A = - 1/2 and tan B = - 1/3, then A+B =
∏/4
3 ∏/∝
5∏/4
None of these
If sin (∝ - β) = 1/2 and cos (∝ + β) = 1/2, where ∝ and β are positive acute angles, then:
∝ = 45o
β= 15o
∝= 15o, β = 45o
∝ = 60o, β = 15o
The value of sin A sin (60o-A) sin (60o +A) is equal to
Sin 3 A
The value of Cos2 A ( 3-4 cos2 A)2 + sin2 A ( 3-4 sin2A)2 =
Cos 4 A
sin 4A
1
The value of sin 20o sin 40o sin 60o sin 80o is equal to
-3/16
5/16
3/16
-5/16
The value of x for the maximum value of√3 cos x + sin x, is
30o
45o
60o
90o
The value of cot (45o + θ) cot (45o - θ) is:
-1
0
∞
Sin 2 θ
Cos 2θ
Cosec 2 θ
Sec 2 θ
The value of cos 15o is
