
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 triangle $ABC$ with internal angles $A$, $B$, and $C$, and it is known that $$2\sin^{2}(B+C)= \sqrt {3}\sin2A.$$  
(Ⅰ) Find the degree measure of $A$;  
(Ⅱ) If $BC=7$ and $AC=5$, find the area $S$ of $\triangle ABC$.

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