-cos(x)
The function -\cos(x) is the negative of the cosine function, which is a fundamental trigonometric function. The cosine function, denoted as \cos(x), measures the horizontal coordinate of a point on the unit circle corresponding to an angle x. By negating this function, -\cos(x) reflects the values of \cos(x) across the x-axis, resulting in a wave that oscillates between 0 and 1.
The graph of -\cos(x) has the same periodicity as \cos(x), with a period of 2\pi. This means it repeats its values every 2\pi units along the x-axis. The maximum value of -\cos(x) is 0, occurring at odd multiples of \pi, while the minimum value is -1, occurring at even multiples of \pi.