Use a calculator to evaluate sec 85 degrees

OK. I used my calculator to evaluate sec (85 degrees).

My calculator doesn't have a "sec" button on it.

But I remembered that

sec of an angle = 1 / (cosine of the same angle).

So I used my calculator to find cos (85), and then I hit the

" 1/x " key, and got 11.474, which I knew to be sec (85).