How do i get the secant on a calculator without having a sintax error?

Question

amistre64 · Answer

get new batteries :)

phi · Answer

go back to basics

sec x = 1/cos x

mathmale · Answer

Try this:  suppose you want to find the secant of 30 degrees.
1.  Set your calculator to DEGREE mode.
2.  Press the appropriate key for cos(
3.  type in 30, followed by a right parenthesis:  you should see cos(30)
4.  enter
This result is cos 30 deg.

To obtain sec 30 deg, use either the |dw:1396298646647:dw|

mathmale · Answer

key, or find the reciprocal of cos 30 by typing this in:   1/cos(30)      ENTER.

mathmale · Answer

this assumes you have a TI-83 or -84 calculator.

amistre64 · Answer

but 1/cos(90) still gives me a syntax error ....

mathmale · Answer

cos 90 deg is zero, so the reciprocal of that is undefined.  
Thus, the secant of 90 deg is also undefined.