Question

Which equation should be used to graph $y=sec^{-1} (x)$ on a calculator?
$y = \frac{1}{sec(x)} \\y=\frac{1}{cos^{-1} (x)} \\y=sec(\frac{1}{x} )\\y=cos^{-1} (\frac{1}{x} )$

Answer 1

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Answer:

  (d)  y = arccos(1/x)

Step-by-step explanation:

You are given y = arcsec(x), which means sec(y) = x = 1/cos(y). Then ...

  cos(y) = 1/x

  y = arccos(1/x) . . . . . matches choice D