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Tan-1

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Tan-1, TAN-1, tan-1, or tan may refer to:

  • tany = tan(x), sometimes interpreted as arctan(x) or arctangent of x, the compositional inverse of the trigonometric function tangent (see below for ambiguity)
  • tanx = tan(x), sometimes interpreted as (tan(x)) = ⁠1/tan(x)⁠ = cot(x) or cotangent of x, the multiplicative inverse (or reciprocal) of the trigonometric function tangent (see above for ambiguity)
  • tan x, sometimes interpreted as tan(x) = tan(⁠1/x⁠), the tangent of the multiplicative inverse (or reciprocal) of x (see below for ambiguity)
  • tan x, sometimes interpreted as (tan(x)) = ⁠1/tan(x)⁠ = cot(x) or cotangent of x, the multiplicative inverse (or reciprocal) of the trigonometric function tangent (see above for ambiguity)

Because of ambiguity, the notation arctan(x) or (tan(x)), is recommended.

See also

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