y = x^2 + 1,
y'= 2x.
y'(1) = 2.
dertay/dertax = y'(1) = 2
dertay = 2dertax
y = 2 + derta y = 2 + 2dertax = 2[1 + derta x]
x = 1 + derta x
y/x = 2[1 + derta x]/[1 + derta x] = 2
y = x^2 + 1,
y'= 2x.
y'(1) = 2.
dertay/dertax = y'(1) = 2
dertay = 2dertax
y = 2 + derta y = 2 + 2dertax = 2[1 + derta x]
x = 1 + derta x
y/x = 2[1 + derta x]/[1 + derta x] = 2