
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
In triangle $\triangle ABC$, $a$, $b$, $c$ are the lengths of the sides opposite to the internal angles $A$, $B$, $C$, respectively, and satisfy $\left(b-a\right)\left(\sin B+\sin A\right)=c\left( \sqrt {3}\sin B-\sin C\right)$.

(1) Find the measure of angle $A$.

(2) Then, among the three conditions: ① $a=2$, ② $B= \dfrac{\pi }{4}$, ③ $c= \sqrt {3}b$, choose two conditions that uniquely determine $\triangle ABC$ and answer the following question. If ____, ____, find the area of $\triangle ABC$. Note: If multiple choices are selected for answering separately, the score will be based on the first choice.

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