Color inverse with animation

shader_type canvas_item;

uniform float strength : hint_range(0.0, 1) = 1.0;
uniform float cycle_speed : hint_range(0.1, 1) = 1.0;
uniform float duration : hint_range(0.1, 1) = 1.0;

void fragment(){
    vec4 color = texture(TEXTURE, UV);
    COLOR = vec4(1.0 - color.rgb * strength, color.a) * cos(TIME * cycle_speed) / duration;
}