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Sagot :
[tex]f(t)=t^4+t^2-5\\
\\
f(b)-f(-b)=b^4+b^2-5-[(-b)^4+(-b)^2-5]\\
\\
f(b)-f(-b)=b^4+b^2-5-b^4-b^2+5\\
\\
\boxed{f(b)-f(-b)=0}
[/tex]
[tex]f(b)-f(-b)=b^4+b^2-5-((-b)^4+(-b)^2-5)\\
f(b)-f(-b)=b^4+b^2-5-(b^4+b^2-5)\\
f(b)-f(-b)=b^4+b^2-5-b^4-b^2+5\\
f(b)-f(-b)=0
[/tex]
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