
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 that $a$, $b$, $c$ are the sides opposite to angles A, B, C respectively in $\triangle ABC$, and vectors $\overrightarrow {m}$ = (cosA, sinA), $\overrightarrow {n}$ = (1, $\sqrt {3}$), if $\overrightarrow {m} || \overrightarrow {n}$ and $a \cos B + b \cos A = c \sin C$, then angle B is equal to ___.

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