Find the Exact Value of the Expression $\tan \left[ \tan ^ { - 1 } ( - 0.4 ) \right]$

question 79

Multiple Choice

Find the exact value of the expression. Do not use a calculator.
- $\tan \left[ \tan ^ { - 1 } ( - 0.4 ) \right]$

• A) -0.6
• B) -0.4
• C) -2.3652
• D) -2.5

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Definitions:

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