If sin(theta) = 3/5, find cos(theta).
A2/5
B3/5
C4/5
D1
Explanation
cos^2 = 1 – sin^2 = 1 – 9/25 = 16/25 => cos = 4/5.
Exam Relevance
- Topic: Trigonometry
- Subtopic: Identities
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