Question 626514
{{{expr(4/9)c^2-1}}}


{{{(expr(2/3)c)^2-1^2}}}


{{{(expr(2/3)c-1)(expr(2/3)c-1)}}}


So {{{expr(4/9)c^2-1}}} factors to {{{(expr(2/3)c-1)(expr(2/3)c-1)}}}


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