
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
Given the function $f(x)=\cos (2x-\dfrac{\pi }{6})\sin 2x-\dfrac{1}{4}(x\in \mathbb{R})$

$(1)$ Find the smallest positive period of the function $f(x)$.

$(2)$ Find the maximum and minimum values of the function $f(x)$ on the interval $\left[ -\dfrac{\pi }{4},0 \right]$.

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