Is |\sin x|=-\sin x as x Approaches 0-?

Click For Summary
SUMMARY

The expression |\sin x| = -\sin x as x approaches 0 from the left (x → 0-) is correct. As x approaches 0 from negative values, \sin x is negative, making the absolute value of \sin x equal to -\sin x. This conclusion holds true specifically for values of x in the interval (-π, 0).

PREREQUISITES
  • Understanding of limits in calculus
  • Knowledge of trigonometric functions, specifically sine
  • Familiarity with absolute value concepts
  • Basic skills in analyzing function behavior near critical points
NEXT STEPS
  • Study the behavior of trigonometric functions near their limits
  • Learn about the properties of absolute values in calculus
  • Explore the concept of one-sided limits in more depth
  • Review examples of oscillating functions and their limits
USEFUL FOR

Students of calculus, mathematics educators, and anyone interested in understanding the behavior of trigonometric functions and limits.

Kamataat
Messages
137
Reaction score
0
Is it correct that [itex]|\sin x|=-\sin x[/itex] as [itex]x\rightarrow 0-[/itex]?

It's clear for a function like [itex]y=x[/itex], but I ask the question since the sine oscillates from positive to negative values, so for different x's the abs. value is either pos. or neg. Or do I only need to consider values of x that are between -pi and 0?

I know the limit is zero, I just need to know how to write the intermediate step of getting rid of the abs. value sign.

- Kamataat
 
Physics news on Phys.org
If you're approaching 0 from the left (so bottom, smaller values i.e. negatives) then the sine is negative there, so |sinx| indeed becomes -sinx.
 
Thanks for the quick reply!

- Kamataat
 

Similar threads

  • · Replies 22 ·
Replies
22
Views
4K
  • · Replies 6 ·
Replies
6
Views
4K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 2 ·
Replies
2
Views
4K
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
4
Views
2K
  • · Replies 2 ·
Replies
2
Views
11K
  • · Replies 5 ·
Replies
5
Views
2K