What is the value of $\sec 0 °$ ?

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Solution

Find the value of $\sec 0 °$ .
$\begin{array}{rcl} \sec 0 ° & = & \frac{1}{\cos 0 °} \\ \Rightarrow & \sec 0 ° = \frac{1}{1} (∵ \cos 0^{0} = 1) \\ \Rightarrow & \sec 0 ° = 1 \end{array}$
Therefore, required the value is $\begin{array}{rcl} \sec 0 ° & = & 1 \end{array}$ .

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