product of 2 numbers a and b represented as sum of four squares i , j , k , l
echo ( " i ▁ = ▁ " . $ i . " STRNEWLINE " ) ; echo ( " j ▁ = ▁ " . $ j . " STRNEWLINE " ) ; echo ( " k ▁ = ▁ " . $ k . " STRNEWLINE " ) ; echo ( " l ▁ = ▁ " . $ l . " STRNEWLINE " ) ; echo " " . ▁ " Product of " $ a . " ▁ and ▁ " . $ b ; echo " ▁ can ▁ be ▁ written " . " ▁ as ▁ sum ▁ of ▁ squares ▁ of ▁ i , ▁ " . " j , ▁ k , ▁ l STRNEWLINE " ; echo $ ab . " ▁ = ▁ " ; echo $ i . " * " ▁ . ▁ $ i . ▁ " + " echo $ j . " * " . $ j . " ▁ + ▁ " ; echo $ k . " * " ▁ . ▁ $ k ▁ . ▁ " + " echo $ l . " * " . $ l . " STRNEWLINE " ; echo " STRNEWLINE " ; } } } } } }