The fundamental Pythagorean identity states that the sum of the squares of sine and cosine of any angle equals 1. From this, two other identities follow: 1 + tan²θ = sec²θ and 1 + cot²θ = csc²θ.
If sin θ = 3/5, find cos θ.
cos²θ = 1 − sin²θ = 1 − 9/25 = 16/25. cos θ = 4/5
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