So first of all you do as per normal of finding what the basic angle is. However look at the angle range for this tan(x-0.1). So basically it is like shifting the curve to the right in the +ve direction of the x-axis. Therefore you need to consider the change in principle angle too which is shown as the one that i corrected. Then while you solve the anti clockwise motion which you'll find 2 roots to the solution, you'll have to consider the clockwise motion which is the negative side of the angle. So there will be a total of 3 solutions to this question. (P.S. dont forget to change it to x form !! )