Question

The complete solution set of the equation
sin−1√1+x/2 − √2−x=cot⁻¹ (tan√2−x)
−sin⁻¹√1−x/2 is :
A. [2−π²/4,1]
B. [1−π²/4,1]
C. [2−π²/4,0]
D. [−1,1]