I'm just wondering, how would I find the exact value of the following expression of sec(-25pie/6)? It's in my textbook but someone scratched the solution out...
Thanks!
$\displaystyle \sec\left(-\frac{25\pi}{6}\right) =
$
$\displaystyle \sec\left(\frac{25\pi}{6}\right) =$
$\displaystyle \frac{1}{\cos\left(\frac{25\pi}{6}\right)} =$
$\displaystyle \frac{1}{\cos\left(\frac{\pi}{6}\right)} = \frac{2}{\sqrt{3}}$
btw ...
this is pie
this is pi ...