Use reference angles to find the exact value. Rationalize the denominator of your answer, if needed. Select "Undefined" if applicable.
\[
\tan \left(-\frac{\pi}{4}\right)=
\]
Final Answer: \(\boxed{-1}\)
Step 1 :The tangent function has a period of π, so the tangent of an angle and the tangent of that angle plus any multiple of π are the same.
Step 2 :Therefore, the tangent of -π/4 is the same as the tangent of -π/4 + π = π/4.
Step 3 :The tangent of π/4 is 1, so the tangent of -π/4 is also 1.
Step 4 :However, considering the negative sign, the tangent of -π/4 is -1.
Step 5 :Final Answer: \(\boxed{-1}\)