
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
Among the following four propositions:

(1) The domain of the function $y=\tan (x+ \frac {π}{4})$ is $\{x|x\neq \frac {π}{4}+kπ,k\in Z\}$;

(2) Given $\sin α= \frac {1}{2}$, and $α\in[0,2π]$, the set of values for $α$ is $\{\frac {π}{6}\}$;

(3) The graph of the function $f(x)=\sin 2x+a\cos 2x$ is symmetric about the line $x=- \frac {π}{8}$, then the value of $a$ equals $(-1)$;

(4) The minimum value of the function $y=\cos ^{2}x+\sin x$ is $(-1)$.

Fill in the sequence number of the propositions you believe are correct on the line ___.

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