Question

Select all that are undefined. sec (45°) csc (0°) sec (90°)

Answer 1

Sec(45°) = 1/cos(45°) = 1/(rt(2)/2) = rt(2)

csc(0°) = 1/sin(0°) = 1/0 /undefined/

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

Answer 2

Answer:

csc (0°) and sec (90°) are not defined.

Step-by-step explanation:

Given the options wehave to select the option which is undefinesd

First option: sec 45°

$sec45^{\circ}=\frac{1}{cos(45^{\circ})}=\frac{1}{\frac{1}{\sqrt2}}=\sqrt2$

which is defined

Second option: csc(0°)

$csc(0^{\circ})=\frac{1}{sin0}=\frac{1}{0}=\infty$

which is not defined

Third option: sec(90°)

$sec(90^{\circ})=\frac{1}{cos(90)}=\frac{1}{0}=\infty$

which is not defined.

Hence, option 2 and 3 are not defined.