Derivative of absolute value function |Cosx-Sinx| at x= π/6 & x=π/3

How to prove the Continuity of f(x)=|x-2| at x=2. Continuity of Modulus function.

How to prove the Discontinuity of f(x)=sgn(x+|x|) at x=0. Discontinuity of Signum function.

Definite integrals _ Leibniz integral Rule.

Definite integrals involving modulus function (Part 89). f(x)=|cosx|

Limits _ RHL and LHL.Quotient of greatest Integer Function and Signum function. Existence of limits.

|| Domain of functions || Sum of Logarithmic function and inverse trigonometric function ||

|| Euler's Theorem on Homogeneous Functions in two variables || Partial Differentiation ||

Domain of functions _ Inverse cosine function _ Logarithmic function.

Definite integrals _ Leibniz integral formula _ Derivatives of integrals.

Functional Equations _ Trigonometric Functions _ Trigonometric identities.

|| Functional Equations _ Exponential function _ Find f(x) ||

Dirac Delta Function _ Three important conceptual problems based on derivative property.