Question

I need some math help please

Answer 1

B. -cos x

Step-by-step explanation:

Look:

-cos 0° = -1

-cos
`1\pi rad =` -cos 180° = 1

Hope this helps

Answer 2

B

Step-by-step explanation:

Look at the graph of cosine, and it is just this graph flipped over the X axis, so you know this one is -cos(x)