# Exact value

• Mar 31st 2010, 04:10 PM
kelvinly
Exact value
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!
• Mar 31st 2010, 04:34 PM
skeeter
Quote:

Originally Posted by kelvinly
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

http://1.bp.blogspot.com/_vXd1RSJQmT...g/s320/pie.jpg

this is pi ...

http://dustyloft.files.wordpress.com...pg?w=174&h=184
• Mar 31st 2010, 04:35 PM
kelvinly
Quote:

Originally Posted by skeeter
$\displaystyle \sec\left(-\frac{25\pi}{6}\right) =$

$\displaystyle \sec\left(\frac{25\pi}{6}\right) =$

$\displaystyle \frac{1}{\cos\left(\frac{25\pi}{6}\right)} =$

$\displaystyle \frac{1}{\cos\left(\frac{\pi}{6}\right)} = \frac{2}{\sqrt{3}}$

btw ...

this is pie

http://1.bp.blogspot.com/_vXd1RSJQmT...g/s320/pie.jpg

this is pi ...

http://dustyloft.files.wordpress.com...pg?w=174&h=184

lol yeah typo! and thanks for the step by step solutions!