
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
In an acute-angled triangle \(PQR\) with \(PQ > QR\), the altitudes \(PT\) and \(RS\) are drawn. \(QN\) is the diameter of the circumcircle of triangle \(PQR\). It is known that the acute angle between the altitudes \(PT\) and \(RS\) is \(\alpha\), and \(PR = a\). Find the area of the quadrilateral \(NSQT\).

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