Test: SAT Math

1.

Which of the following is equivalent to \dpi{100} \frac{(\frac{1}{t}-\frac{1}{x})}{x-t} ? Assume that denominators are always nonzero.

(xt)^{-1}

x^{2}-t^{2}

\frac{x}{t}

x-t

t-x

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