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[" If "a,b,c" are the "p^(" th "),q^(" t...

[" If "a,b,c" are the "p^(" th "),q^(" th "),r^(" th ")" terms "],[" in H.P.then "bcquad pquad 1],[[ca,q,1],[ab,r,1]|=],[" 1"],[" abc "],[a^(2)+b^(2)+c^(2)]

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