tan-1 (1/7) + tan-1 (1/13) =
tan-1(1/9)
tan-1 (20)
tan-1(2/9)
tan-1(3/4)
The principal value of sin-1 (1/2)
π
π/2
π/6
0
Sin (1/2 cos-1 4/5)
The product s(s-a) (s-b) (s-c) is equal to
Δ
Δ2
2 Δ
Δ/s
In a ΔABC, ∠A = π/2, then cos2 B + cos2 C equals
-2
-1
1
If sin θ = 3/8 and θ is acute, find sin 2 θ
The value of is
2
3
√2
If sin-1 (1/2) = tan-1 x, find the value of x
√3
1/2
3/16
3/8
3/4
