Trigonometric function help

  • #1
asatru jesus
3
0
f(x)= sin 3x - (1/2)sin x, find the period.

i know the period for sin 3x is 2pi/3 and the period of sin x is 2pi but how do you subtract these? I totally forget how to do this! I mean i could find the answer with any graphing program but i want to know how to do this type of problem.
 

Answers and Replies

  • #2
amcavoy
665
0
asatru jesus said:
f(x)= sin 3x - (1/2)sin x, find the period.

i know the period for sin 3x is 2pi/3 and the period of sin x is 2pi but how do you subtract these? I totally forget how to do this! I mean i could find the answer with any graphing program but i want to know how to do this type of problem.

Go with the greater value (period). Can you see why?
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
43,021
970
Why subtract them? The two functions will both repeat when you reach the least common multiple of their separate periods. Here, it should be obvious that [tex]2\pi[/tex] is a multiple of [tex]\frac{2\pi}{3}[/tex].
 

Suggested for: Trigonometric function help

  • Last Post
Replies
9
Views
1K
  • Last Post
Replies
1
Views
422
  • Last Post
Replies
4
Views
918
Replies
11
Views
354
  • Last Post
Replies
1
Views
411
  • Last Post
Replies
4
Views
350
  • Last Post
Replies
2
Views
505
  • Last Post
Replies
2
Views
523
  • Last Post
Replies
3
Views
533
  • Last Post
Replies
0
Views
386
Top