The value of sin 20o sin 40o sin 60o sin 80o is equal to
-3/16
5/16
3/16
-5/16
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 minimum value of 5 sin2θ + 4 cos2θ is
1
2
3
4
The value of Cos2θ + Sec2θ is always
Less than 1
Equal to 1
Greater than 1, but less than 2
Greater than or equal to 2
The maximum value of Sinθ Cosθ is
0
-1/2
1/2
The maximum value 3 cos θ + 4 sin θ is
5
None of these
The value of cos 15o is
(tan 7o) (tan 23o) (tan 60o)(tan 67o)(tan83o) is
7
√3
The value of sin A sin (60o-A) sin (60o +A) is equal to
Sin 3 A
The value of 1+ cos 56o + cos 58o - cos 66o is equal to
2 cos 28o cos 29o cos 33o
4 cos 28o cos 29o cos 33o
4 cos 28o cos 29o sin 33o
2 cos 28o cos 29o sin 33o
