Question

Which graph represents a vertical reflection of y=cos(x)
?(1 point)
Responses

y=−cos(x)

y is equal to negative cosine times x

y=cos(−x)

y is equal to cosine of negative x

y=sin(x)

y is equal to sine of x

y=cos(x+π)

Answer 1

y = −cos(x)

Reason: a vertical reflection across the x-axis multiplies the function by −1, giving y = −cos(x). (Note: cos(x+π) = −cos(x) so its graph coincides, but cos(x+π) is produced by a horizontal shift, not the vertical-reflection transformation.)