Assertion: trigonometric function's period | /r/HasAspect | same value
Facets:
Source sentences:
text: For a function, to be periodical means that one point after a certain period will have the same value again, and after that same period will again have the same value.
text: For a function, to be periodical means that one point after a certain period will have the same value again, and after that same period will again have the same value.