Secant of Three Right Angles less Angle

Theorem

 * $\sec \left({\dfrac {3 \pi} 2 - \theta}\right) = - \csc \theta$

where $\sec$ and $\csc$ are secant and cosecant respectively.

Also see

 * Sine of Three Right Angles less Angle
 * Cosine of Three Right Angles less Angle
 * Tangent of Three Right Angles less Angle
 * Cotangent of Three Right Angles less Angle
 * Cosecant of Three Right Angles less Angle