Express sine of 60° in terms of cosine.

Question Analysis

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

Key Concept Explanation

Complementary Angles: In trigonometry, for two angles and such that , and . This is based on the co - function identities.

Step-by-Step Solution

1. Find the complementary angle of :

The complementary angle of is .

2. Apply the co - function identity:

By the co - function identity , when , we have

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Geometry