If tan-1x+2+tan-1x-2-tan-112=0 then one of the value of x=
-1
5
12
1
-12
Explanation for the correct option:
Step1: Solve for x
tan-1x+2+tan-1x-2-tan-112=0tan-1x+2+tan-1x-2=tan-112tan-12x1-x2-4=tan-1122x5-x2=125-x2=4xx2+4x-5=0x+5x-1=0x=1,-5
Hence option (4) is correct