inverse trigonometric functions
The reverse functions of sine, cosine, tangent, cotangent, secant and cosecant.

  Read    Denoted  
  the inverse sine of x    arcsin x or sin-1x  
  the inverse cosine of x    arccos x or cos-1x  
  the inverse tangent of x    arctan x or tan-1x  
  the inverse cotangent of x    arccot x, or arcctg x or cot-1x  
  the inverse of secant of x    arcsec x or sec-1x  
  the inverse cosecant of x    arccsc x, or arccosec x or csc-1x  

Since sin30° = 0.5, the inverse sine of 0.5 is 30°, that is, arcsin0.5 = 30°.

Related Terms: cosecant (cosec or csc), cosine (cos), cotangent (cot), secant (sec), sine (sin), tangent (tan)

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