x xxxx xxxxxx xx \(x=(x,x)\) xxx xxxxx xx xxxxx \(x=(x,x)\). xxxx xxxx xx xxxxxx xxxxxxxx xx xx xxxxxxxx xxxxx, xxx xxx xxxx xxxxxxx xxxx xxxxxxxxx xxxxxxx \(x\) xxxx xxx \(x\) xxxxx. xxx xxxxx xxxx xxx xxxx xxxxxx xxxxxx, xxx xxxxxxx xxxxxxxxxx xxx xxxxxx \(x\). xxx xxxx xxxxxxxx xxxxxxxxx xx xxxxx xxxxx \(x\)?
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