please solve them for me quick:
1)Evaluate Tan-1(tan(-6))
2)Simplify sin -1 (sinx + cosx)/root 2
5)Solve
tan-1(x+1) + tan-1(x-1) = tan-18/31
please solve them for me quick:
1)Evaluate Tan-1(tan(-6))
2)Simplify sin -1 (sinx + cosx)/root 2
5)Solve
tan-1(x+1) + tan-1(x-1) = tan-18/31