Algebra-2

Question Analysis
This problem assesses the understanding of the cosine function in a right triangle.

Key Concept Explanation
The cosine of an angle in a right triangle is the ratio of the length of the adjacent side to the length of the hypotenuse. Here, we are given the adjacent side and the hypotenuse, and we need to find the cosine of the angle.

Step-by-step Solution
1. Identify the given values: adjacent side = 4 units, hypotenuse = 10 units
2. Apply the cosine formula:

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