Question

Prove that cosine is a even function.​

Answer 1

Answer:

cos(x)=cos(−x) , therefore cosine is an even function. ... 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] .

Step-by-step explanation:

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Answer 2

Step-by-step explanation:

cos(x)=cos(−x) , therefore cosine is an even function. ... 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] .