
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 the lengths of the sides opposite to angles $A$, $B$, $C$ being $a$, $b$, $c$ respectively, it is known that $a=2$, $b+c=2a$, $3\sin A=5\sin B$. The size of angle $C$ is ______________.

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