Evaluate `lim_(x to (pi)/(4)) (1 - tanx)/(x - (pi)/(4))`

Explanation

To evaluate the limit \( \lim_{x \to \frac{\pi}{4}} \frac{1 - \tan x}{x - \frac{\pi}{4}} \), we can follow these steps:

### Step 1: Direct Substitution
First, we substitute \( x = \frac{\pi}{4} \) into the expression:
\[ 1 - \tan\left(\frac{\pi}{4}\right) = 1 - 1 = 0 \]
and
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