Question

Which graph represents the reflection in the x-axis of the curve y = cos x

Answer 1

The curve represented by Green color Dotted Lines in the attached figure represents the Reflection in x-axis of the curve
`y = cos x`.

Explanation:

As we know, the value of
`cosx` lies between (-1,1) and its graph is a curve. Its value keeps on varying between -1 and 1 only depending on the value of
`x`.

The value of
`y` is
`\text{0}` at
`x = (\pi)/(2)`. Few values are labeled in the figure attached in the answer. The value
`y` is 1 at
`x = 0`.

The curve shown in blue color solid line represents the curve of
`y = cos x`.

And the curve shown in the dotted green color in the attached figure represents the reflection in the x-axis.