1. ## 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!

2. 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

this is pi ...

3. 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

this is pi ...

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