# OEF derivatives --- Introduction ---

This module actually contains 33 exercises on derivatives of real functions of one variable.

### Circle

We have a circle whose radius increases at a constant speed of centimeters per second. At moment time when the radius equals centimeters, what is the speed at which its area increases (in cm2/s)?

### Circle II

We have a circle whose radius increases at a constant speed of centimeters per second. At moment time when its area equals square centimeters, what is the speed at which the area increases (in cm2/s)?

### Circle III

We have a circle whose area increases at a constant speed of square centimeters per second. At the moment when the area equals cm2, what is the speed at which its radius increases (in cm/s)?

### Circle IV

We have a circle whose area increases at a constant speed of square centimeters per second. At the moment when its radius equals cm, what is the speed at which the radius increases (in cm/s)?

### Composition I

We have two differentiable functions f(x) and g(x), with values and derivatives shown in the following table.

x-3-2-10123
f(x)
f '(x)
g(x)
g'(x)

Let h(x) = f(g(x)). Compute the derivative h'().

### Composition II *

We have 3 differentiable functions f(x), g(x) and h(x), with values and derivatives shown in the following table.

x-3-2-10123
f(x)
f '(x)
g(x)
g'(x)
h(x)
h'(x)

Let s(x) = f(g(h(x))). Compute the derivative s'().

### Mixed composition

We have a differentiable function f(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)

Let g(x) = , and let h(x) = g(f(x)). Compute the derivative h'().

### Virtual chain Ia

Let be a differentiable function, with derivative . Compute the derivative of .

### Virtual chain Ib

Let be a differentiable function, with derivative . Compute the derivative of .

### Division I

We have two differentiable functions f(x) and g(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)
g(x)
g'(x)

Let h(x) = f(x)/g(x). Compute the derivative h'().

### Mixed division

We have a differentiable function f(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)

Let h(x) = / f(x). Compute the derivative h'().

### Hyperbolic functions I

Compute the derivative of the function f(x) = .

### Multiplication I

We have two differentiable functions f(x) and g(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)
g(x)
g'(x)

Let h(x) = f(x)g(x). Compute the derivative h'().

### Multiplication II

We have two differentiable functions f(x) and g(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)
f ''(x)
g(x)
g'(x)
g''(x)

Let h(x) = f(x)g(x). Compute the second derivative h''().

### Mixed multiplication

We have a differentiable function f(x), with values and derivatives shown in the following table.

x-2-1012
f(x)
f '(x)

Let h(x) = f(x). Compute the derivative h'().

### Virtual multiplication I

Let be a differentiable function, with derivative . Compute the derivative of .

### Polynomial I

Compute the derivative of the function f(x) = , for x=.

### Polynomial II

Compute the derivative of the function .

### Inverse derivative

Let : -> be the function defined by

(x) = .

Verify that is bijective, therefore we have an inverse function (x) = -1(x). Calculate the value of derivative  '() .

You must reply with a pricision of at least 4 significant digits.

### Rectangle I

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Rectangle II

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Rectangle III

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Rectangle IV

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Rectangle V

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Rectangle VI

We have a rectangle whose at a constant speed of centimeters per second, but whose stays constant at . At the moment when equals , what is the speed (in ) at which changes?

### Right triangle

We have a right triangle as follows, where AB= , and AC at a constant speed of /s. At the moment when AC= , what is the speed at which BC changes (in /s)?

### Tower

Somebody walks towards a tower at a constant speed of meters per second. If the height of the tower is meters, at which speed (in m/s) the distance between the man and the top of the tower decreases, when the distance between him and the foot of the tower is meters?

### Trigonometric functions I

Compute the derivative of the function f(x) = .

### Trigonometric functions III

Compute the derivative of the function f(x) = at the point x=.

Other exercises on: derivatives   Calculus

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