Section 11.2, Derivatives of Exponential Functions
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Section 11.2, Derivatives of Exponential Functions
Section 11.2, Derivatives of Exponential Functions. If y = ex, then y ... derivative of
the exponential function of base e. Examples. 1. y = 5x y = 5x ln 5. 2. y = 10x3.
Section 11.2, Derivatives of Exponential Functions
If y = ex , then y 0 = ex . By the chain rule, if y = eg(x) , then y 0 = eg(x) · g 0 (x). Examples 1. f (x) = 6ex f 0 (x) = 6ex 2. g(x) = ex
2
g 0 (x) = 2xex 3. y = 3ex
4
2
−1 4
y 0 = 12x3 ex 4. y = x2 ex
−1
2
Here, we have a product, so the product rule is necessary: 2
y 0 = 2xex + 2x3 ex 5. h(z) = ln ez
2
4
By properties of logarithms, we can simply this function to h(z) = z 4 , so h0 (z) = 4z 3 2+ex e2x
6. f (x) =
= 2e−2x + e−x
f 0 (x) = −4e−2x − e−x 4
7. y = ln(ez + 1) 4
y0 =
4z 3 ez ez 4 + 1
We can generalize the derivative of y = ex to y = ax if a > 0 and a 6= 1. If y = ax , then y 0 = ax ln a. If y = ag(x) , then y 0 = ag(x) g 0 (x) ln a. x
This holds because we can rewrite y as y = ax = eln a = ex ln a , then use the formula for the derivative of the exponential function of base e. Examples 1. y = 5x y 0 = 5x ln 5 3
