Page No 317:
Question 1:
Find the derivative of the following functions from first principle:
(i) –x (ii) (–x)–1 (iii) sin (x + 1)
(iv) 
(i) Let f(x) = –x. Accordingly,
By first principle,
(ii) Let
. Accordingly,
By first principle,
(iii) Let f(x) = sin (x + 1). Accordingly,
By first principle,
(iv) Let
. Accordingly,
By first principle,
