Question

How do you evaluate the expression `sec45`?

Answer 1

`root 2`2

Explanation:

Draw a square with side-length = 1 unit.
Draw any diagonal.
In either of the triangles the acute angles are 45°.
the diagonal is the hypotenuse of both triangles, its length is `root`2
Sec = hypotenuse/adjacent
so sec 45° = `root`2, since adjacent = 1