Reciprocal & Inverse Trigonometric Functions (Edexcel A-Level Mathematics): Quizzes

$\csc \theta = \frac{1}{\sin \theta}$

$\theta = 0^\circ, 180^\circ, 360^\circ, \dots$

$(-\infty, -1] \cup [1, \infty)$

$360^\circ$ or $2\pi$ radians

$\sec \theta = \frac{1}{\cos \theta}$

$\theta = 90^\circ, 270^\circ, 450^\circ, \dots$

$360^\circ$ or $2\pi$ radians

$\cot \theta = \frac{\cos \theta}{\sin \theta}$

$180^\circ$ or $\pi$ radians

It is a decreasing curve