Answer:
[tex]\displaystyle Cosine[/tex]
Step-by-step explanation:
[tex]\displaystyle \frac{HYPOTENUSE}{ADJACENT} = sec\:θ \\ \frac{ADJACENT}{HYPOTENUSE} = cos\:θ[/tex]
You can easily tell how these trigonometric ratios are multiplicative inverses [reciprocals] of each other.
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