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Let a,b,c,a, b, c,a,b,c, and ddd be real numbers such that a2+b2=1,a^2+b^2=1,a2+b2=1, c2+d2=1,c^2+d^2=1,c2+d2=1, and ac+bd=0ac+bd=0 ac+bd=0. Determine ab+cd ab+cd ab+cd.
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