Select the functions that have a value of -1. sin180° cos180° tan180° csc180° sec180° cot180°

We have to break each degree in terms of 90

A)

Which is in third quadrant, therefore sine is negative hence

B)

Which is in third quadrant, therefore cosine is negative hence

C)

Which is in third quadrant, therefore tangent is positive hence

D)

Which is in third quadrant, therefore cosec is negative hence

not defined

E)

Which is in third quadrant, therefore secant is negative hence

F)

Which is in third quadrant, therefore tangent is positive hence

not defined

Hence only and

have value -1

Hope this will help