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Trigonometry Circular Functions

rebecca120

New member
May 8, 2012
1
Sec-1(-rad(2))
 

CaptainBlack

Well-known member
Jan 26, 2012
890
Sec-1(-rad(2))
Please supply more context, like the question as asked.

The argument of \( \rm{asec} \) is just a number so I don't see what \( \rm{rad} \) is doing in your question.

CB
 

HallsofIvy

Well-known member
MHB Math Helper
Jan 29, 2012
1,151
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].

Or do you mean "radical(2)" as in "[tex]\sqrt{2}[/tex]"? [tex]\frac{1}{\sqrt{2}}= \frac{\sqrt{2}}{2}[/tex] so find [tex]cos^{-1}\left(-\frac{\sqrt{2}}{2}\right)[/tex]. You shouldn't need a calculator for that.