
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 the function $f(x)=ax+b\sin x\ (0 < x < \frac {π}{2})$, if $a\neq b$ and $a, b\in \{-2,0,1,2\}$, the probability that the slope of the tangent line at any point on the graph of $f(x)$ is non-negative is ___.

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