Symmetry Of The Cosine Function: Why Cos(-X) = Cos(X)

cos(-x)=

cosx

cos(-x) is equal to cos(x).

This is because the cosine function is an even function, which means that it is symmetric about the y-axis. In other words, the value of cosine for an angle x is the same as the value of cosine for the angle -x.

Therefore, cos(-x) = cos(x).

More Answers:
Mastering The Cosine Function: Simplifying And Evaluating Trigonometric Expressions With Cos(X+Y) Identity And Pythagorean Theorem
Trigonometric Formula In Simplifying Sin(X-Y) Expression
How To Simplify The Expression Sin(X+Y) Using The Identity Sin(A+B) = Sin(A)Cos(B) + Cos(A)Sin(B)

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