title: Csc-1
text: # Csc-1
  
  Csc-1, CSC-1, csc-1, or $csc^{−1}$ may refer to:
  
  * csc x−1 = csc(x)−1 = excsc(x) or excosecant of x, an old trigonometric function
  * $csc^{−1}y$ = $csc^{−1}(y),$ sometimes interpreted as arccsc(y) or arccosecant of y, the compositional inverse of the trigonometric function cosecant (see below for ambiguity)
  * $csc^{−1}x$ = $csc^{−1}(x),$ sometimes interpreted as $(csc(x))^{−1}$ = 1/csc(x) = sin(x) or sine of x, the multiplicative inverse (or reciprocal) of the trigonometric function cosecant (see above for ambiguity)
  * csc $x^{−1},$ sometimes interpreted as $csc(x^{−1})$ = csc(1/x), the cosecant of the multiplicative inverse (or reciprocal) of x (see below for ambiguity)
  * csc $x^{−1},$ sometimes interpreted as $(csc(x))^{−1}$ = 1/csc(x) = sin(x) or sine of x, the multiplicative inverse (or reciprocal) of the trigonometric function cosecant (see above for ambiguity)
  