
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 $A=(a+b)^{2}-3b^{2}$, $B=2(a+b)(a-b)-3ab$, find:<br/>$(1)$ Simplify $A-B$;<br/>$(2)$ If $(a-3)^{2}+|b-4|=0$, find the value of $A-B$.

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