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[" If "a,b" are roots of the equation "x^(2)+qx+1=0" and "c,d" are roots of "x^(2)+px+1=0" ,then the value of "],[[(a-c)(b-c)(a+d)(b+d)" will be- "," (3) "-p^(2)-q^(2)," (4) "p^(2)+q^(2)]]

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