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3. Evaluate the integral f tan x sec3 x dx 4. The arc length L of a curve y = f(x) over the interval (a,

3. Evaluate the integral f tan x sec3 x dx 4. The arc length L of a curve y = f(x) over the interval (a, b) is given by the formula b dy 2 L = 1 + dx. a dx Find the arc length of the curve y = In x from x = 1 to x = 2

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