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Problem
## EXERCISE 2.2 Write the following functions in the simplest form: 6.
tan
−
1
x
a
2
−
x
2
,
∣
x
∣
<
a
\tan ^{-1} \frac{x}{\sqrt{a^{2}-x^{2}}},|x|<a
tan
−
1
a
2
−
x
2
x
,
∣
x
∣
<
a
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