The set of values of x for which tan−1⁡x1−x2=sin−1⁡x holds,

We observe that RHS is defined for all x∈[−1, 1]whereas LHS is meaningful for -1 < x < l.Also, for x∈(−1, 1), we havetan−1⁡x1−x2=tan−1⁡sin⁡θcos⁡θ, where x=sin⁡θ=θ=sin−1⁡x