x
1
−x

If x < 0 then | x | is equal to
x
1
−x

If x <0 then | x | is equal to
x
1
−x

If x = 0 then | x | is equal to
X
0
1
-x

If x > 0 then | x | is equal to:
x
0
1
−x

If the trace of the matrix is 0, then x is equal to
-2, 3
-3, 2
2, -3
3, -2

Let f(x)=tan−1x. Then, f′(x)+f′′(x) is =0, when x is equal to
0
1
i
−i

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