Respuesta :

jamesphantos11

Answer:

sin(81)

Step-by-step explanation:

Since the sine of something is the ratio of the opposite side to the hypotenuse, to get the same ratio in cosine, you take the complement of the angle. So the answer is sin(90 - 9) or sin(81).

The expression in terms of cosine cos 81°. The expression is obtained by the trigonometric rules.

What is trigonometry?

Trigonometry deals with the relationship between the sides and angles of a right-angle triangle.

The given expression is;

sin9°

The expression in terms of cosine.

sin 9°= sin(90-81°)

sin 9°= cos 81°

Hence,the expression in terms of cosine cos 81°.

To learn more about the trigonometry, refer to the link;

https://brainly.com/question/26719838

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