
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 sides $a$, $b$, and $c$ opposite to angles $A$, $B$, and $C$ respectively. If it satisfies the condition $1 - 2\sin{B}\sin{C} = \cos{2B} + \cos{2C} - \cos{2A}$:

1. Find the magnitude of angle $A$.
2. Determine the maximum value of $\sin{B} + \sin{C}$.

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