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Explain solution for RD Sharma class class 12 chapter 3 Inverse Trigonometric Functions exercise Very short answer question 60 math

Answers (1)

Answer: \frac{\pi}{8}

Given

\tan ^{-1}\left(\tan \frac{9 \pi}{8}\right)

Hint: To solve \tan  function we can get the solution.

Solution:   

\begin{aligned} \tan ^{-1}\left(\tan \frac{9 \pi}{8}\right) &=\tan ^{-1}\left(\tan \left(\pi+\frac{\pi}{8}\right)\right) \\ &=\tan ^{-1}\left(\tan \left(\frac{\pi}{8}\right)\right) \\ &=\frac{\pi}{8} \end{aligned}

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