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Example 18 - Chapter 5 Class 12 Continuity and Differentiability
Last updated at July 26, 2026 by Teachoo
Algebra of continous functions
Chapter 5 Class 12 Continuity and Differentiability
Concept wise
- Checking continuity at a given point
- Checking continuity at any point
- Checking continuity using LHL and RHL
-
Algebra of continous functions
- Continuity of composite functions
- Checking if funciton is differentiable
- Finding derivative of a function by chain rule
- Finding derivative of Implicit functions
- Finding derivative of Inverse trigonometric functions
- Finding derivative of Exponential & logarithm functions
- Logarithmic Differentiation - Type 1
- Logarithmic Differentiation - Type 2
- Derivatives in parametric form
- Finding second order derivatives - Normal form
- Finding second order derivatives- Implicit form
- Proofs
- Verify Rolles theorem
- Verify Mean Value Theorem
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Transcript
Example 18 Prove that the function defined by f (x) = tan x is a continuous function.Let π(π₯) = tanβ‘π₯ π(π) = π¬π’π§β‘π/ππ¨π¬β‘π Here, π(π₯) is defined for all real number except πππβ‘π = 0 i.e. for all x except x = (ππ+π) π /π Let π(π₯)=sinβ‘π₯ & π(π₯)=cosβ‘π₯ We know that sin x & cosβ‘π₯ is continuous for all real numbers. Therefore, π(π₯) & π(π₯) is continuous. By Algebra of continuous function If π, π are continuous , then π/π is continuous. Thus, Rational Function π(π₯) = sinβ‘π₯/cosβ‘π₯ is continuous for all real numbers except at points where πππ π₯ = 0 i.e. π₯ β (2π+1) π/2 Hence, tanβ‘π₯ is continuous at all real numbers except π=(ππ+π) π /π
