cos(-x)
cosx
The function cos(-x) means cosine of the negative of x. In other words, we evaluate the cosine function for the opposite angle of x on the unit circle.
The cosine function is an even function, which means that cos(-x) = cos(x) for all values of x. This property is a result of the geometric definition of cosine on the unit circle, where the cosine of an angle is the x-coordinate of the point where the angle intercepts the unit circle.
Therefore, to find cos(-x), we simply evaluate the cosine of x. For example, if x = π/4, then cos(-x) = cos(-π/4) = cos(π/4) = √2/2.
In summary, cos(-x) is equal to cos(x) because cosine is an even function.
More Answers:
Mastering Trigonometric Identity: How to Calculate Sin(A-B) Using Angle Subtraction FormulaSimplify Trigonometric Expressions with Sine of the Sum of Two Angles Formula
Understanding the Basics of Absolute Value: A Guide to Finding The Distance Between a Number and Zero
Error 403 The request cannot be completed because you have exceeded your quota. : quotaExceeded