Answer: cosec θ.
- A cos θ
- B tan θ
- C cosec θ
- D sec θ
Correct answer: C. cosec θ
Explanation: cosec θ = 1/sin θ (cosecant is the reciprocal of sine).
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