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## Homework Statement

Determine the average rate of change of the function y = 2cos (x - pi/3) + 1 for the following internal:

pi/2

__<__x

__<__5pi/4

## Homework Equations

AROC = [ f(x

_{2}) - f(x

_{1}) ] / x

_{2}) - x

_{1}

## The Attempt at a Solution

For an approx. value, I would set the calculator in radian mode and just plug everything into the equation, right?

Where I'm stuck is how to get an EXACT answer.