Figure 49
\(f(x) =\ln~\sec~x, 0\leq x\leq \dfrac{\pi}{4}\).
\(f(x) =\ln~\sec~x, 0\leq x\leq \dfrac{\pi}{4}\). \(f(x) =\ln~\sec~x, 0\leq x\leq \dfrac{\pi}{4}\). \(f(x) =\ln~\sec~x, 0\leq x\leq \dfrac{\pi}{4}\).