cos(-x)
The cosine function, written as cos(x), is a trigonometric function that relates the angle x to the ratio of the length of the side adjacent to the angle x to the hypotenuse in a right triangle
The cosine function, written as cos(x), is a trigonometric function that relates the angle x to the ratio of the length of the side adjacent to the angle x to the hypotenuse in a right triangle. The cosine function is periodic with a period of 2π, which means it repeats itself every 2π units.
Now, let’s consider the expression cos(-x). Here, the negative sign is applied to the angle x.
To understand cos(-x), we can use the identity cos(-x) = cos(x). This identity states that the cosine function of a negative angle is equal to the cosine function of the positive angle.
This is because the cosine function is an even function, which means it is symmetrical about the y-axis. The values of cos(x) and cos(-x) are the same for any given angle x.
Therefore, cos(-x) is equal to cos(x). In other words, the cosine function of a negative angle is equal to the cosine of the corresponding positive angle.
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