A. π/12
B. π/3
C. 3π/4
D. π/6
sin-1(2cos2 x-1)cos-1(1-2sin2 x)
4 Tan-1 1/5- Tan-1 1/70+Tan-1 1/99 =
Tan (π/4+1/2cos-1a/b) +tan (π/4-1/2cos-1a/b) =
If 2Tan-1(cos x) = Tan-1(2 cosec x) then x=
Tan-1 1/3+ Tan-1 1/5+ Tan-1 1/7+ Tan-1 1/8 =
If Cosec-1 x= 2Cot-1 7+ Cos-1(3/4) then the value of x is
IfTan-1(1/7)= α, Tan-1(1/3)=β then cos 2α =
Cos (sin-13/5+Sin-1 5/13)=
The range of Sin-1 x - Cos-1 x is
The range of Sin-1 x+ Cos-1 x is