Trigonometryeasy · Past Paper
Which of the following is the fundamental Pythagorean identity for any angle θ?
Asin²θ - cos²θ = 1
Bsin²θ + cos²θ = 1
Csinθ + cosθ = 1
Dsin²θ + cos²θ = 0
✓ Correct Answer: B — sin²θ + cos²θ = 1
The basic Pythagorean identity states that the sum of the squares of sine and cosine for the same angle is always 1.
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