anemone
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Let $$a$$, $$b$$, $$c$$ and $$d$$ be positive real numbers such that
$$a^2+b^2+(a-b)^2=c^2+d^2+(c-d)^2$$.
Prove that
$$a^4+b^4+(a-b)^4=c^4+d^4+(c-d)^4$$.
$$a^2+b^2+(a-b)^2=c^2+d^2+(c-d)^2$$.
Prove that
$$a^4+b^4+(a-b)^4=c^4+d^4+(c-d)^4$$.