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Find the Exact Solution to the Equation Without a Calculator $\tan \left( \tan ^ { - 1 } \mathrm { x } \right) = 20$

Question 377

Multiple Choice

Find the exact solution to the equation without a calculator.
- $\tan \left( \tan ^ { - 1 } \mathrm { x } \right) = 20$

A) 10
B) 20
C) 0
D) 40

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