I'm so stuck on this. I have no clue where to start.
sec (tan^-1 4)
(the tan is an inverse with the -1, 4 is the number)
In case you're exaggerating a bit...
Draw a right triangle. Label the non-right base angle as A. Label the "opposite" and "adjacent" sides as 4 and 1, respectively.
Use the Pythagorean Theorem to find the length of the hypotenuse.
Read the value of the sine from the triangle.
Since the secant is r/x, it is equal to .