# Interal Explenation

1. Aug 31, 2009

### Stratosphere

This isn't a homework question so I decided not to post it there, can someone quickly explain what happened here,

I can't figure out how they got the sec$$^{3}$$ into sec and then how they got sec into cos it doesn't explain anything on the website either.

2. Aug 31, 2009

### snipez90

Um, they canceled sec^2(theta) from the top and bottom? And also the definition of sec is 1/cos...

3. Aug 31, 2009

### Stratosphere

Yeah I realized that they canceled sec^2 after I posted it. I get now why the changed sec^-1 to cos thanks, I guess I forgot some of my trig.