Answer:
[tex]\boxed{ \text{Min. = -1; max. = 1}}\\[/tex]
Step-by-step explanation:
The value of cosx ranges from -1 to 1, so -cosx ranges from 1 to -1.
The minimum value is -1, and the maximum value is +1.
[tex]\boxed{ \textbf{Min. = -1; max. = 1}}\\[/tex]
The number 8 in the argument does not affect the amplitude of the wave. It affects only the frequency.
In the diagram, both y = -cos8x (purple) and y = -cosx (black) range from -1 to +1, but the purple cosine curve has eight times the frequency of the black one.
