Question
$7-18$ Find the length of the curve.$$y=\ln (\sec x), \quad 0 \leqslant x \leqslant \pi / 4$$
Step 1
Using the chain rule, we get $$\frac{dy}{dx} = \frac{1}{\sec x} \cdot \sec x \tan x = \tan x.$$ Show more…
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