Evaluate log_7sqrt(7).
We have 7^1/2=sqrt(7), so log_7 sqrt(7) = 1/2.
Complete the following task based on the instruction and optional input provided.### Instruction:
Evaluate log_7sqrt(7).

### Output:
We have 7^1/2=sqrt(7), so log_7 sqrt(7) = 1/2.