Question

What is cos(360°+x) equal to​

Answer 1

cos(360 + x) = cos x

Proof:

cosine identity:

cos(x + y) = cosxcosy - sinxsiny

or

cos(360 + x) = cos360cox - sin360sinx

but

cos360 = 1 and sin360 = 0

Therefore,

cos(360 + x) = cos x

Answer 2

1

Explanation:

We know the value of cos 360° is always equal to 1.