Question

Please help
What is the amplitude of the sinusoid given by y=-4cos(2x)

Answer 1

amplitude is the height of the sine wave (from the equilibrium position)

y = A cos ( bx )

|A| = amplitude

Answer 2

@perl is it -4 then

Answer 3

amplitude is always positive, like distance :)

Answer 4

I put absolute bars around A

Answer 5

Oh so 4

Answer 6

Thank you