Which trigonometric function is equivalent to sec (-270) ? a. sec (-120) c. sec (-30) b. sec (60) d. sec (90)

The equivalent of sec (-270) will be found as follows:

we add our angle to 360°

-270+360

=90

But sec (-270) is a positive value, this implies that the angle that will give us the same answer as sec (-270) should also give us the positive value. This means that 90 is our answer since it will give us the positive sec value.

The answer is d. sec (90)