Cosecant of Three Right Angles

Theorem

 * $\csc 270^\circ = \csc \dfrac {3 \pi} 2 = -1$

where $\csc$ denotes cosecant.

Also see

 * Sine of Three Right Angles
 * Cosine of Three Right Angles
 * Tangent of Three Right Angles
 * Cotangent of Three Right Angles
 * Secant of Three Right Angles