ANSWER
None of the above
EXPLANATION
Recall the mnemonic CAH, from trigonometric ratios.
CAH means the cosine ratio is the ratio of the length of the adjacent side to the length of the hypotenuse.
This implies that,
[tex] \cos(23 \degree) = \frac{length \: of \: adjacent \: side}{length \: of \: the \: hypotenuse} [/tex]
The side adjacent to the 23° angle is 12 units and the hypotenuse is 13 units.
This implies that,
[tex] \cos(23 \degree) = \frac{12}{13} [/tex]
None of the provided options is correct
