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The Derivative tells us the slope of a function at any point.
There are rules we can follow to find many derivatives.
For example:
*The slope of a constant value (like 3) is always 0
*The slope of a line like 2x is 2, or 3x is 3 etc
*and so on.
Here are useful rules to help you work out the derivatives of many functions (with examples below). Note: the little mark ’ means ’Derivative of’, and f and g are functions.Common FunctionsFunction
Derivative
Constantc0Linex1axaSquarex22xSquare Root√x(½)x-½Exponentialexexaxln(a) axLogarithmsln(x)1/xloga(x)1 / (x ln(a))Trigonometry (x is in radians)sin(x)cos(x)cos(x)−sin(x)tan(x)sec2(x)Inverse Trigonometrysin-1(x)1/√(1−x2)cos-1(x)−1/√(1−x2)tan-1(x)1/(1+x2)RulesFunction
Derivative
Multiplication by constantcfcf’Power Rulexnnxn−1Sum Rulef + gf’ + g’Difference Rulef - gf’ − g’Product Rulefgf g’ + f’ gQuotient Rulef/g(f’ g − g’ f )/g2Reciprocal Rule1/f−f’/f2Chain Rule
(as ’Composition of Functions’)f º g(f’ º g) × g’Chain Rule (using ’ )f(g(x))f’(g(x))g’(x)Chain Rule (using ddx )dydx = dydududx
’The derivative of’ is also written ddx
So ddxsin(x) and sin(x)’ both mean ’The derivative of sin(x)’
Search this site. Many of the rules for calculating derivatives of real-valued functions can be applied to calculating the derivatives of vector-valued functions as well. Recall that the derivative of a real-valued function can be interpreted as the slope of a tangent line or the instantaneous rate of change of the function.ExamplesExample: what is the derivative of sin(x) ?
From the table above it is listed as being cos(x)
It can be written as:
sin(x) = cos(x)
Or:
sin(x)’ = cos(x)Power RuleExample: What is x3 ?
The question is asking ’what is the derivative of x3 ?’
We can use the Power Rule, where n=3:
xn = nxn−1
x3 = 3x3−1 = 3x2
(In other words the derivative of x3 is 3x2)
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So it is simply this: Unit 3 Derivative Rules Of Compositesap Calculus Integrals
3x^2’>
’multiply by power
then reduce power by 1’
It can also be used in cases like this:Example: What is (1/x) ?
1/x is also x-1
We can use the Power Rule, where n = −1:
xn = nxn−1
x−1 = −1x−1−1
= −x−2
= −1x2
So we just did this:
-x^-2’>
which simplifies to −1/x2Multiplication by constantExample: What is 5x3 ?
the derivative of cf = cf’
the derivative of 5f = 5f’
We know (from the Power Rule):
x3 = 3x3−1 = 3x2
So:
5x3 = 5x3 = 5 × 3x2 = 15x2Sum RuleExample: What is the derivative of x2+x3 ?
The Sum Rule says:
the derivative of f + g = f’ + g’
So we can work out each derivative separately and then add them.
Using the Power Rule:
*x2 = 2x
*x3 = 3x2
And so:
the derivative of x2 + x3 = 2x + 3x2Difference Rule
It doesn’t have to be x, we can differentiate with respect to, for example, v: Example: What is (v3−v4) ?
The Difference Rule says
the derivative of f − g = f’ − g’
So we can work out each derivative separately and then subtract them.
Using the Power Rule:
*v3 = 3v2
*v4 = 4v3
And so:
the derivative of v3 − v4 = 3v2 − 4v3Sum, Difference, Constant Multiplication And Power RulesExample: What is (5z2 + z3 − 7z4) ?
Using the Power Rule:
*z2 = 2z
*z3 = 3z2
*z4 = 4z3
And so:
(5z2 + z3 − 7z4) = 5 × 2z + 3z2 − 7 × 4z3 = 10z + 3z2 − 28z3Product RuleExample: What is the derivative of cos(x)sin(x) ?
The Product Rule says:
the derivative of fg = f g’ + f’ g
In our case:
*f = cos
*g = sin
We know (from the table above):
*cos(x) = −sin(x)
*sin(x) = cos(x)
So:
the derivative of cos(x)sin(x) = cos(x)cos(x) − sin(x)sin(x)
= cos2(x) − sin2(x)Quotient Rule
To help you remember:
(fg)’ = gf’ − fg’g2
The derivative of ’High over Low’ is:
’Low dHigh minus High dLow, over the line and square the Low’
Example: What is the derivative of cos(x)/x ?
In our case:
*f = cos
*g = x
We know (from the table above):
*f’ = −sin(x)
*g’ = 1Unit 3 Derivative Rules Of Compositesap Calculus 2nd Edition
So:
the derivative of cos(x)x = Low dHigh minus High dLowover the line and square the Low
= x(−sin(x)) − cos(x)(1)x2
= −xsin(x) + cos(x)x2Reciprocal RuleExample: What is (1/x) ?
The Reciprocal Rule says:
the derivative of 1f = −f’f2
With f(x)= x, we know that f’(x) = 1
So:
the derivative of 1x = −1x2
Which is the same result we got above using the Power Rule.Chain RuleExample: What is ddxsin(x2) ?
sin(x2) is made up of sin() and x2:
*f(g) = sin(g)
*g(x) = x2
The Chain Rule says:
the derivative of f(g(x)) = f’(g(x))g’(x)
The individual derivatives are:
*f’(g) = cos(g)
*g’(x) = 2x
So:
ddxsin(x2) = cos(g(x)) (2x)
= 2x cos(x2)
Another way of writing the Chain Rule is: dydx = dydududx
Let’s do the previous example again using that formula:Example: What is ddxsin(x2) ?
dydx = dydududx
Have u = x2, so y = sin(u):
ddx sin(x2) = ddusin(u)ddxx2
Differentiate each:
ddx sin(x2) = cos(u) (2x)
Substitue back u = x2 and simplify:
ddx sin(x2) = 2x cos(x2)
Same result as before (thank goodness!)
Another couple of examples of the Chain Rule:Example: What is (1/cos(x)) ?
1/cos(x) is made up of 1/g and cos():
*f(g) = 1/g
*g(x) = cos(x)
The Chain Rule says:
the derivative of f(g(x)) = f’(g(x))g’(x)
The individual derivatives are:
*f’(g) = −1/(g2)
*g’(x) = −sin(x)
So:
(1/cos(x))’ = −1/(g(x))2 × −sin(x)
= sin(x)/cos2(x)
Note: sin(x)/cos2(x) is also tan(x)/cos(x), or many other forms.Example: What is (5x−2)3 ?
The Chain Rule says:Unit 3 Derivative Rules Of Compositesap Calculus Solver
the derivative of f(g(x)) = f’(g(x))g’(x)
(5x-2)3 is made up of g3 and 5x-2:
*f(g) = g3
*g(x) = 5x−2
The individual derivatives are:
*f’(g) = 3g2 (by the Power Rule)
*g’(x) = 5
So:
(5x−2)3 = 3g(x)2 × 5 = 15(5x−2)2
Unit 3 – Derivatives
_________________________________________________________________
Student Learning Objectives for Unit 3:
Upon completion of Unit 3, students will be able to
*Conceptualize derivative presented graphically, numerically, and analytically.
*Interpret derivative as an instantaneous rate of change
*Calculate slopes and derivatives using the definition of a derivative.
*Graph f from the graph of f’, graph f’ from the graph of f, and graph the derivative of a function given numerically with data.
*Articulate and identify corresponding characteristic of graphs of f and f’
*Determine where a function is not differentiable and distinguish between corners, cusps, discontinuities, and vertical tangents.
*Approximate derivatives from graphs and tables of values
*Know derivatives of basic functions, including power, exponential, logarithmic, trigonometric, and inverse trigonometric functions.
*Use sum, product, quotient, chain rules to calculate derivative of composite functions.
*Use derivative to calculate the instantaneous rate of change.
*Use derivatives to analyze straight line motion and solve other problems involving rates of change.
*Articulate and identify corresponding characteristic of graphs of f, f’, and f”
*Use the graph of f” to identify the points of inflection and concavity of f.
*Use the graph of f’ to identify the local (relative) extrema and the increasing/decreasing behavior of f.
*Find slopes of parameterized curves
*Find derivatives using implicit differentiation.
*Find derivatives using the Power Rule for Rational Powers of x.
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