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Omni-MATH / Let a,b,c and d be real numbers such that a+b+c+d=2 and ab+bc+cd+da+ac+bd=0. Find the minimum value and the maximum value of the product abcd.

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problem

Let a,b,ca, b,c and dd be real numbers such that a+b+c+d=2a + b + c + d = 2 and ab+bc+cd+da+ac+bd=0ab + bc + cd + da + ac + bd = 0. Find the minimum value and the maximum value of the product abcdabcd.
Plain-text mathematical notation (without MathML)
Let a,b,c and d be real numbers such that a+b+c+d=2 and ab+bc+cd+da+ac+bd=0.
Find the minimum value and the maximum value of the product abcd.
Original LaTeX notation
Let $a, b,c$ and $d$ be real numbers such that $a + b + c + d = 2$ and $ab + bc + cd + da + ac + bd = 0$.
Find the minimum value and the maximum value of the product $abcd$.

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