i'm doing trigonemetric substitutions

[afcwestwarrior]

if x=a sec theta would that mean that theta= sec^-1 x

[Defennder]

You omitted the 'a'. It's better to re-write this in terms of cos instead, in the form arc cos(...) = theta.

[afcwestwarrior]

how do rewrite it in terms of cos, would it be 1/cos

[Defennder]

Yes.

[afcwestwarrior]

oh ok