Question

What is the rate of change for f(x)=-2cos4x-3 on the interval from x=pi/4 to x=pi/2?

Answer 1

rate of change for f(x) is

rate of change = [f(x2) - f(x1)] / [(x2 - x1)]

here x2 = pi/2 and x1 = pi/4

Answer 2

now f(x2) = -2cos(4.pi/2) - 3 = ...................
and f(x1) = -2cos(4.pi/4) -3 = ....................

can you do it now???

Answer 3

Thanks, but my answer choices are: -16/pi, -pi/16, 2/pi, or pi/2

Answer 4

I'm still confused