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fplot(1): use abs()

--- a/sys/man/1/fplot

+++ b/sys/man/1/fplot

@@ -45,7 +45,7 @@

 .IR page (1).

 .IP

 .EX

-fplot -c -s 400x400 'sqrt(x*x)' 'x^3' | page

+fplot -c -s 400x400 'abs(x)' 'x^3' | page

 .EE

 .SH SOURCE

 .B /sys/src/cmd/fplot.c

-- 

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