Calculus with Inverse Trig Functions

Calculus with Inverse Trig Functions

Basic Concepts

  • Understand the inverse trigonometric functions Sine, Cosine, and Tangent.
  • Inverse functions written as (sin^-1(x), cos^-1(x), tan^-1(x)) or (arcsin(x), arccos(x), arctan(x)) are the results of reversing the sine, cosine and tangent functions respectively.
  • Domain of arcsin(x) and arccos(x) is [-1,1], and range is from [-π/2, π/2] for arcsin(x), and [0, π] for arccos(x).
  • Domain of arctan(x) is all real numbers, range is (-π/2, π/2).
  • Understand periodicity and symmetry inherent in inverse trigonometric functions.
  • Remember that inverse trig functions are continuous and neighborhood preserving.

Differentiating Inverse Trig Functions

  • The derivatives of the inverse sine (arcsin), inverse cosine (arccos) and inverse tangent (arctan) functions are crucial.
  • The derivative of arcsin(x) is 1/√(1-x²).
  • The derivative of arccos(x) is -1/√(1-x²).
  • The derivative of arctan(x) is 1/(1+x²).
  • Chain Rule is used to differentiate composite function where inverse trigonometric function is introduced.
  • Use implicit differentiation when the equation can not be easily rearranged to y = f(x) format.

Integration Involving Inverse Trig Functions

  • Bear in mind that integration is a process that reverses differentiation.
  • Integral of 1/√(a²-x²) results in arcsin(x/a).
  • Integral of -1/√(a²-x²) provides arccos(x/a).
  • Integral of 1/(a²+x²) becomes arctan(x/a).
  • Apply integration by substitution technique for some complex forms.
  • Utilise the method of integration by parts if the integral is a product of two functions.

Real-world applications

  • Appreciate the fact that in practicality, physical phenomena like wave behaviour, pendulum motion and even medical imaging can be modelled using inverse trigonometric functions.
  • Through calculus involving inverse trigonometric functions, it is possible to gain insights and make accurate predictions about such models.
  • Understand the crucial role of arc length calculation, which accentuates the application of calculus on inverse trig functions.