# The sine curve overlaid on the cosine curve

If you overlay the sine curve over the cosine curve you can see that they are out of sync with each other by 90°.

**NOTE:**

This is used in industry to analyse vibrations in all sorts of applications.

If you overlay the sine curve over the cosine curve you can see that they are out of sync with each other by 90°.

**NOTE:**

This is used in industry to analyse vibrations in all sorts of applications.