Trigonometry
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## Trigonometry

acos

      acos (x)

  Aliases: `arccos`

  The arccos (inverse cos) function.

acosh

      acosh (x)

  Aliases: `arccosh`

  The arccosh (inverse cosh) function.

acot

      acot (x)

  Aliases: `arccot`

  The arccot (inverse cot) function.

acoth

      acoth (x)

  Aliases: `arccoth`

  The arccoth (inverse coth) function.

acsc

      acsc (x)

  Aliases: `arccsc`

  The inverse cosecant function.

acsch

      acsch (x)

  Aliases: `arccsch`

  The inverse hyperbolic cosecant function.

asec

      asec (x)

  Aliases: `arcsec`

  The inverse secant function.

asech

      asech (x)

  Aliases: `arcsech`

  The inverse hyperbolic secant function.

asin

      asin (x)

  Aliases: `arcsin`

  The arcsin (inverse sin) function.

asinh

      asinh (x)

  Aliases: `arcsinh`

  The arcsinh (inverse sinh) function.

atan

      atan (x)

  Aliases: `arctan`

  Calculates the arctan (inverse tan) function.

  See Wikipedia or Mathworld for more information.

atanh

      atanh (x)

  Aliases: `arctanh`

  The arctanh (inverse tanh) function.

atan2

      atan2 (y, x)

  Aliases: `arctan2`

  Calculates the arctan2 function. If `x>0` then it returns `atan(y/x)`. If `x<0` then it returns `sign(y) * (pi - atan(|y/x|)`. When `x=0` it returns `sign(y) * pi/2`. `atan2(0,0)` returns 0 rather than failing.

  See Wikipedia or Mathworld for more information.

cos

      cos (x)

  Calculates the cosine function.

  See Wikipedia or Planetmath for more information.

cosh

      cosh (x)

  Calculates the hyperbolic cosine function.

  See Wikipedia or Planetmath for more information.

cot

      cot (x)

  The cotangent function.

  See Wikipedia or Planetmath for more information.

coth

      coth (x)

  The hyperbolic cotangent function.

  See Wikipedia or Planetmath for more information.

csc

      csc (x)

  The cosecant function.

  See Wikipedia or Planetmath for more information.

csch

      csch (x)

  The hyperbolic cosecant function.

  See Wikipedia or Planetmath for more information.

sec

      sec (x)

  The secant function.

  See Wikipedia or Planetmath for more information.

sech

      sech (x)

  The hyperbolic secant function.

  See Wikipedia or Planetmath for more information.

sin

      sin (x)

  Calculates the sine function.

  See Wikipedia or Planetmath for more information.

sinh

      sinh (x)

  Calculates the hyperbolic sine function.

  See Wikipedia or Planetmath for more information.

tan

      tan (x)

  Calculates the tan function.

  See Wikipedia or Planetmath for more information.

tanh

      tanh (x)

  The hyperbolic tangent function.

  See Wikipedia or Planetmath for more information.

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