Question Number 35115 by ajfour last updated on 15/May/18
Commented by ajfour last updated on 15/May/18
$$\:{perhaps}\:\:{mrW}\:{Sir}\:{views}\:{and} \\ $$$${attempts}\:{this}\:{after}\:{a}\:{while},\:{though}. \\ $$
Commented by ajfour last updated on 15/May/18
$${Find}\:\boldsymbol{{r}}\:{in}\:{terms}\:{of}\:\boldsymbol{{a}},\:\boldsymbol{{b}},\:\boldsymbol{{c}}\:. \\ $$