Here, why have we put x=c+h If we put x=c directly (as in other questions), then also we'll obtain - Maths - Continuity and Differentiability

Question

Here, why have we put x=c+h? If we put x=c directly (as in other
questions), then also we'll obtain sin c only

Sourav Kumar Sharma · Accepted Answer

Here, why have we put x=c+h? If we put x=c directly (as in other questions), then also we'll obtain sin c only.