- Thread starter
- #1
rebecca120
New member
- May 8, 2012
- 1
Sec-1(-rad(2))
Please supply more context, like the question as asked.Sec-1(-rad(2))
-rad(2)? Do you mean "- 2 radians"? Use the fact that sec(x)= 1/cos(x) and use a calculator (making sure it is in "radian" mode) to find [tex]cos^{-1}(-1/2)[/tex].Sec-1(-rad(2))