Using McLaurin’s series expansion, the value of log (sec x) is
1
\(x + \frac{{2{x^3}}}{{3!}} + \frac{{4{x^5}}}{{5!}} + \ldots \)
2
\(\frac{{{x^2}}}{{2!}} + \frac{{2{x^4}}}{{4!}} + \frac{{16{x^6}}}{{\;6!}} + \ldots \)
3
\(x + \frac{{{x^3}}}{{3!}} + \frac{{3{x^5}}}{{5!}} + \ldots \)
4
\(\frac{{2{x^2}}}{{2!}} + \frac{{3{x^4}}}{{4!}} + \frac{{7{x^6}}}{{6!}} + \ldots \)