Understanding Cosecant (csc) What is Cosecant? Cosecant (csc) is a trigonometric function that's defined as the reciprocal of sine. For any angle θ, csc(θ) = 1/sin(θ). θ Key Properties Domain: x ≠nπ, where n is an integer Range: (-∞, -1] ∪ [1, ∞) Period: 2π Common Values csc(30°) = 2 csc(45°) = √2 ≈ 1.4142 csc(60°) = 2/√3 ≈ 1.1547