Cosine Function
The graph is symmetric to the y- axis therefore it is an even function. The majority of functions are neither odd nor even, however, sine and tangent are odd functions and cosine is an even function.
How do you prove cosine is an even function?
cos(x)=cos(−x) , therefore cosine is an even function. Alvin L. To prove that cos(θ) is even, i.e. that cos(−θ)=cos(θ) , we can use the unit circle, which mind you, is the definition of cosine arguments outside the interval [0,π2] .
Is cosine function is an even function?
Sine is an odd function, and cosine is an even function. You may not have come across these adjectives “odd” and “even” when applied to functions, but it's important to know them.
