The correct option is B None of these 90 #176; = 1cos 90 #176;=10, undefined.Hence, the answer is none of these. ...

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Standard Values of Trigonometric Ratios

The value of ...

Question

The value of $sec 90^{\circ}$ is

1

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\frac{2}{\sqrt{3}}

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\sqrt{2}

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None of these

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Solution

The correct option is B None of these
$sec 90 ° = \frac{1}{cos 90 °} = \frac{1}{0},$ undefined.

Hence, the answer is none of these.

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