Question

Select all that are undefined. a. sec (45°) b. csc (0°) c. sec (90°) d. csc(π) e. cot (π)

Answer 1

b, c, d, e

Explanation:

a) sec (45°) = 1/cos(45°) = 1/√2/2 = defined

b) csc (0°) = 1/sin(0°) = 1/0 = impossible = undefined

c) sec (90°) = 1/cos (90°) = 1/0 = impossible = undefined

d) csc (π) = 1/sin (π) = 1/0 = impossible = undefined

e) cot (π) = cos(π)/sin(π) = -1/0 = impossible = undefined