Triangle \(PQR\) is a right-angled triangle.
\(S\) is a point on \(PR\) such that \(QS=QR\).
\(T\) is a point on \(PQ\) such that \(PT=ST\).
Angle \(PST=x\).
Show that angle \(RQS=2x\).
Give a reason for each step of your working.[3]
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