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[" Hence,"(m^(2)-n^(2))=4sqrt(mn)],[" EX...

[" Hence,"(m^(2)-n^(2))=4sqrt(mn)],[" EXAMPLE "4" If "sec theta+tan theta=m," show that "((m^(2)-1))/((m^(2)+1))=sin theta.],[" sournon We have "]

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