
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
It is known that the lines $x = \frac {\pi}{4}$ and $x= \frac {5\pi}{4}$ are two adjacent axes of symmetry for the graph of the function $f(x)=\sin(\omega x + \phi)$ $(\omega > 0, -\frac {\pi}{2} < \phi < \frac {\pi}{2})$.

(1) Determine the values of $\omega$ and $\phi$.
(2) If $α ∈ (- \frac {3\pi}{4}, - \frac {\pi}{4})$ and $f(α) = -\frac {4}{5}$, find the value of $\sinα$.

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