Solve `tan^(-1)2x+tan^(-1)3x=pi/4`.

Explanation

To solve the equation \( \tan^{-1}(2x) + \tan^{-1}(3x) = \frac{\pi}{4} \), we can use the identity for the sum of inverse tangents. The identity states:

\[ \tan^{-1}(a) + \tan^{-1}(b) = \tan^{-1}\left(\frac{a + b}{1 - ab}\right) \]

when \( ab < 1 \).

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