Inverse Trigonometric Functions
Madhya Pradesh Board · Class 12 · Mathematics
Summary of Inverse Trigonometric Functions for Madhya Pradesh Board Class 12 Mathematics. Key concepts, important points, and chapter overview.
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Inverse trigonometric functions are defined by restricting the domains of trigonometric functions so that they become one-one and onto. This makes inverse functions possible and gives each inverse trigonometric function a principal value branch. The chapter focuses on the six inverse trigonometric f
Key Concepts
If f is one
If f is one-one and onto, then an inverse f⁻¹ exists. The compositions satisfy (f⁻¹ ∘ f)(x) = x and (f ∘ f⁻¹)(y) = y. For inverse trigonometric functi
The value of an inverse trigonometric
The value of an inverse trigonometric function that lies in the range of its principal branch is called its principal value. When no branch is mention
The sine function restricted to [
The sine function restricted to [-π/2, π/2] becomes one-one and onto with range [-1,1]. Therefore, sin⁻¹x has domain [-1,1] and principal value range
The cosine function restricted to [0
The cosine function restricted to [0, π] becomes one-one and onto with range [-1,1]. Therefore, cos⁻¹x has domain [-1,1] and principal value range [0,
cosec⁻¹x has domain R
cosec⁻¹x has domain R - (-1,1) and principal range [-π/2, π/2] - {0}. sec⁻¹x has domain R - (-1,1) and principal range [0, π] - {π/2}. These exclusion
Learning Objectives
- Understand why trigonometric functions need domain restriction to have inverses
- Learn the principal value branches of sin⁻¹, cos⁻¹, cosec⁻¹, sec⁻¹, tan⁻¹, and cot⁻¹
- Use inverse trigonometric identities correctly within their valid domains
- Interpret inverse trigonometric graphs as reflections of original graphs in the line y = x
- Find principal values of standard inverse trigonometric expressions
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