Basics - MathML_and_Javascript

Each entry of the following matrix represents

{(x + y)}^{n}

for some n. When you left-click any individual entry, it should toggle between its expanded and unexpanded forms. You can also unexpand all or expand all.

\begin{matrix} \begin{array}{lll} {(x + y)}^{0} 1 & {(x + y)}^{1} x + y & {(x + y)}^{2} x^{2} + 2 x y + y^{2} \\ {(x + y)}^{1} x + y & {(x + y)}^{2} x^{2} + 2 x y + y^{2} & {(x + y)}^{3} x^{3} + 3 x^{2} y + 3 x y^{2} + y^{3} \\ {(x + y)}^{2} x^{2} + 2 x y + y^{2} & {(x + y)}^{3} x^{3} + 3 x^{2} y + 3 x y^{2} + y^{3} & {(x + y)}^{4} x^{4} + 4 x^{3} y + 6 x^{2} y^{2} + 4 x y^{3} + y^{4} \\ {(x + y)}^{3} x^{3} + 3 x^{2} y + 3 x y^{2} + y^{3} & {(x + y)}^{4} x^{4} + 4 x^{3} y + 6 x^{2} y^{2} + 4 x y^{3} + y^{4} & {(x + y)}^{5} x^{5} + 5 x^{4} y + 10 x^{3} y^{2} + 10 x^{2} y^{3} + 5 x y^{4} + y^{5} \end{array} \end{matrix}