Answer: cosec²θ.
- A sec²θ
- B sin²θ
- C cosec²θ
- D cos²θ
Correct answer: C. cosec²θ
Explanation: Pythagorean identity: 1 + cot²θ = cosec²θ.
Unit circle with standard angles 0, 30, 45, 60, 90 degrees; at 45 degrees the point is (cos45, sin45) = (1/sqrt2, 1/sqrt2).
Concept context
Ratios, identities, and applications in triangles