Derivatives and Integration

Derivatives
Tricks, Shortcuts Symbolically Verbally
Of Sine and Cosine Quickly GRAPHICALLY
Derivatives

The derivative of:
  a CONSTANT
is
zero.

  the PRODUCT OF A CONSTANT AND A FUNCTION
is
the product of the constant and the derivative of the function.

  the PRODUCT OF TWO FUNCTIONS, a first and a second function,
is
the derivative of the first times the second plus the derivative of the second times the first.

  the QUOTIENT OF TWO FUNCTIONS, a first divided by a second function,
is
the derivative of the first times the second minus the derivative of the second times the first, ALL divided by the square of the second.

 
  a FUNCTION OF A FUNCTION, a major function and its argument function, an outer function and the inner function,
is
the product of the derivative of the outer evaluated at the inner and the derivative of the inner.


Arithmetic Tricks, Rules & Shortcuts In Words & Symbols




      The sine and cosine are closely related.


Take A Derivative or Antiderivative or Sine and Cosine

1st: Place the symbol cosine on the horizontal
as in the positive x axis
(as in the cosine is the horizontal component of a vector),
2nd: Place the symbol sine on the vertical
as in the positive y axis
(as in the sine is the vertical component of a vector)
3rd: Place - sin(x) and - cos(x) in the appropriate spots.
 
To Take a first or second or third or fourth ... DERIVATIVE,
move one or two or three or four ... turns in a CLOCKWISE direction.
 
To Take a first or second or third or fourth ... ANTIDERIVATIVE,
move one or two or three or four ... turns in a COUNTER-CLOCKWISE direction.

     


Take First, Second, Third Derivatives of Sine & Cosine Functions GRAPHICALLY

      Use the graphs to takes the derivatives.

      To take the first derivative, use a pencil. Use the middle point of a pencil as a tangent point and point the pencil to the right, the greater x values. Trace the curve, stating the derivative (slope of the tangent) as you do.

      Use the stated derivatives (slopes) to describe the curve which is the derivative functions.

      For example, TAKE THE DERIVATIVE OF THE SINE.

      What's the function?

      The cosine.

      The derivative of the sine is the cosine.

     

Second Derivative

      Two methods for taking the second derivative, the slope of the derivative, are suggested. EITHER repeat the above method using the cosine as the original function, OR, use the movement of the pencil point and the sine function to compute the second derivative of the sine, d2[sin(x)]/dx2.


      To integrate a function times the derivative of another function, use:

     


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