On-line Math 21
On-line Math 21
3.1
Trigonometric functions
3.1.1
Derivatives of sin(x) and cos(x) .
Example 3
Find (x
3
cos(x))
¢
.
Solution
( x
3
cos(x))
¢
=
(x
3
)
¢
cos(x)+x
3
(cos(x))
¢
, by the product rule,
=
3x
2
cos(x)+x
3
(
-
sin(x))
=
3x
2
cos(x)
-
x
3
sin(x).
Copyright (c) 2000 by
David L. Johnson
.
File translated from T
E
X by
T
T
H
, version 2.61.
On 26 Nov 2000, 23:14.