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29 May, 21:27

If a+b=s and a-b=t, then which of the following expresses the value of ab in terms of s and t?

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  1. 29 May, 21:29
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    (s^2-t^2) / 4

    because s^2=A^2+2ab+B^2

    t^2=A^2-2ab-B^2

    so it is easy to caculate
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