Problem
Use identities to fill in the blank. If $\tan \theta=2.5$, then $\cot \theta=$ \[ \cot \theta= \] (Type an integer or decimal.)
Solution
Step 1 ：The cotangent of an angle is the reciprocal of the tangent of that angle.
Step 2 ：So, if \(\tan \theta=2.5\), then \(\cot \theta=1/\tan \theta=1/2.5=0.4\).
Step 3 ：Final Answer: \(\cot \theta= \boxed{0.4}\)
