Question

How do you graph `y=-4cos2x`?

Answer 1

See graph and details.

Explanation:

`Cosine wave: y = - 4 cos 2 x in [ - 4, 4 ]`

Amplitude = 4..

Period `= ( 2 pi )/2 = pi`

Graph, showing range and one period:
graph{(y+4 cos (2x))(x-pi/2 +0y)(x+pi/2+0y)(y^2-16)=0}.