tgh=1

It looks like you may have a typo or an incomplete equation in your message ("tgh=1"). If you meant to refer to "tanh" (the hyperbolic tangent function), then the equation you provided could be interpreted in that context.

The hyperbolic tangent function, \( \tanh(x) \), can be set equal to 1 in order to find its value:

\[ \tanh(x) = 1 \]

To solve for \( x \), recall that:

\[ \tanh(x) = \frac{\sinh(x)}{\cosh(x)} = 1 \]

This means \(\sinh(x) = \cosh(x)\). The values of \( x \) that satisfy this equation are:

\[ x = \frac{\pi}{4} + n\pi i \quad (n \in \mathbb{Z}) \]

However, the primary solution in the real domain where \(\tanh(x) = 1\) occurs at:

\[ x = \infty \]

Please clarify if you were looking for a specific context or if you meant something different.