How does A compare to B a=cos (0+2pi) b=cos (-0)

You can use the double angle formula for A.

Cos (0 + 2pi) = Cos (0) * Cos (2*pi) - Sin (0) * Cos (2*pi)

Cos 0 = 1

Cos (2*pi) = 1

Sin (0) = 0

So you are left with cos (0 + 2pi) = 1 * 1 = 1

there are a couple of ways of handling Cos (-0)

The First and most obvious way is to put it in your calculator just as you see it. Most calculators would do it like this

Cos (

+/-

0

)

=

The result should be 1

You could try using cos (0-0) You will get the same answer - - 1.