$\sec \left( - 90 ^ { \circ } \right)$
A) $\frac { 2 \sqrt { 3 } } { 3 }$
B) Undefined
C) $- 1$
D) 0

Name: $\sec \left( - 90 ^ { \circ } \right)$ A) $\frac { 2 \sqrt { 3 } } { 3 }$ B) Undefined C) $- 1$ D) 0
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Question

Quizplus · Accepted Answer

The secant of -90 degrees is undefined because secant is the reciprocal of cosine, and the cosine of -90 degrees is 0. Since division by zero is undefined, sec($-90^\circ$) is undefined.

sec⁡(−90∘)\sec \left( - 90 ^ { \circ } \right)sec(−90∘) A) 233\frac { 2 \sqrt { 3 } } { 3 }323​​

$\sec \left( - 90 ^ { \circ } \right)$ A) $\frac { 2 \sqrt { 3 } } { 3 }$