which of the following expressions CANNOT be simplified
a.
[tex] \frac{m - 1}{m {}^{2} - 1} [/tex]
b.
[tex] \frac{ {x}^{2} - {y}^{2} }{x + y} [/tex]
c.
[tex] \frac{4n + 12}{n + 3} [/tex]
d.
[tex] \frac{x + y}{x - y} [/tex]
a.
[tex] \frac{m - 1}{m {}^{2} - 1} [/tex]
b.
[tex] \frac{ {x}^{2} - {y}^{2} }{x + y} [/tex]
c.
[tex] \frac{4n + 12}{n + 3} [/tex]
d.
[tex] \frac{x + y}{x - y} [/tex]
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