Use the above figure to answer the question. What’s the angle between the tangents at T in the figure?
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now, for a rational expression, the domain, or "values that x can safely take", applies to the denominator NOT becoming 0, because if the denominator is 0, then the rational turns to undefined.
now, what value of "x" makes this denominator turn to 0, let's check by setting it to 0 then.
so, the domain is all real numbers EXCEPT that one.