`( a+c) /(SQRT(a^(2) - ac+ c^(2)) ` ` ( a+c) /( sqrt(a^(2) + ac+ c^(2))` ` ( a+c) /( sqrt( a^(2) - ac-c^(2))` ` ( a+ c)/( sqrt( a^(2) + 2AC -c^(2))`
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