Final answer:
Sinusoidal functions like sine and cosine functions oscillate indefinitely without approaching a single value, and hence they do not exhibit end behaviour.
Step-by-step explanation:
The end behaviour refers to the behaviour of a function as the input value (often time or position in the context of waves) approaches infinity or negative infinity.
In the case of sinusoidal functions, such as the sine and cosine functions, they oscillate between their minimum and maximum values and do not approach any single value as the input increases or decreases indefinitely.
Therefore, sinusoidal functions do not have an end behaviour like polynomial functions where the terms with the largest exponents dominate the function's behaviour at the extremes.