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What three distinct numbers a,b,c satisfy that f(a) = f(b) = f(c)?

What three distinct numbers a,b,c satisfy that f(a) = f(b) = f(c)?-example-1

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a=-4 , b=0 , c=4 so it will be f(-4)=0
f(0)=0 f(4)=0
User Guinther Kovalski
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