Starting from zero amplitude, the cosine curve repeats itself between
- -180 and 180 degree.
- -90 and 270 degrees.
- 0 and 360 degree.
Explanation from PART66Online
Measuring from a point where the cosine value is zero (-90 degrees), one full period of the cosine wave spans 360 degrees and so completes again at +270 degrees. The intervals -180 degrees to 180 degrees and 0 degrees to 360 degrees begin at cosine peaks (+/-1), not at a zero crossing.
P
piesoup asked · 12 Jan 2015
What is meant by 'repeats itself'?
Thanks
Community Comments (2)
K
Klemis3000
17 Apr 2018
mathsisfun.com/algebra/images/cosine-...
It repeats itself every 360 (2pi) degrees starting from -90 (-pi/2) degrees.
It repeats itself every 360 (2pi) degrees starting from -90 (-pi/2) degrees.
M
Matteo123
6 Mar 2021
ok, but why 0 and 360 isn't correct?
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