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Problem
Problem
The greatest and the least value of the function,
f
(
x
)
=
1
−
2
x
+
x
2
−
1
+
2
x
+
x
2
f(x) = \sqrt{1-2x+x^2} - \sqrt{1+2x+x^2}
f
(
x
)
=
1
−
2
x
+
x
2
−
1
+
2
x
+
x
2
,
x
∈
(
−
∞
,
∞
)
x \in (-\infty, \infty)
x
∈
(
−
∞
,
∞
)
are a. 2, -2 b. 2, -1 c. 2, 0 d. none
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