Geometry

Question Analysis  

The main focus is to use the concept of complementary angles to rewrite in terms of cosine.

Key Concept Explanation  

Complementary Angles: Two angles are complementary if their sum is . In trigonometry, the co - function identity states that and . This relationship is based on the geometric properties of right - angled triangles.

Step-by-Step Solution  

1. Find the complementary angle:

Subtract the given angle from . So, .

2. Apply the co - function identity:

Using the identity , when

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