
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Let the function $f(x)=\tan \frac {x}{4}\cdot \cos ^{2} \frac {x}{4}-2\cos ^{2}\left( \frac {x}{4}+ \frac {\pi}{12}\right)+1$.

(Ⅰ) Find the domain of $f(x)$ and its smallest positive period;

(Ⅱ) Find the maximum and minimum values of $f(x)$ in the interval $[-\pi,0]$.

Present the answer in LaTex format: \boxed{Your answer}
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