Geometry

Question Analysis  

The main focus is leveraging the relationship between cosine and sine of complementary angles to rewrite  in terms of sine.

Key Concept Explanation  

Complementary Angles: Two angles are complementary when their sum equals . The co - function identity states that  and . This identity is derived from the geometric properties of right - angled triangles and the unit circle.

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 , we have

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