The product s(s-a) (s-b) (s-c) is equal to
Δ
Δ2
2 Δ
Δ/s
If sin-1 (1/2) = tan-1 x, find the value of x
√3
1/2
Sin-1 (1/x) =
sin x
cosec-1x
cos x
cos (1/x)
Cos4 A - Sin4 A =
2 Sin2 A - 1
1 - 2 Sin2 A
2 Cos2 A - 1
1 -2 Cos2 A
The value of tan 40o + tan 20o + √3 tan 20o tan 40o is equal to
√12
1/√3
√3/2
Cos (tan-1 3/4) =
4/5
2/5
1/4
3/4
The value of is
2
1
√2
Area of Δ ABC is
1/2 ab cos C
1/2 ab sin c
1/2 ab cos B
1/2 ca sin B
3/16
3/8
tan-1 (1/7) + tan-1 (1/13) =
tan-1(1/9)
tan-1 (20)
tan-1(2/9)
tan-1(3/4)
