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