Let ff be the function defined by f, of, x, equals, sine, left bracket, start fraction, pi, divided by, 2, end fraction, x, right bracket, .f(x)=sin( 2π x). What is the average value of ff on the interval open square bracket, 2, comma, 4, close square bracket[2,4] written in simplest form?
Question
Let ff be the function defined by f, of, x, equals, sine, left bracket, start fraction, pi, divided by, 2, end fraction, x, right bracket, .f(x)=sin( 2π x). What is the average value of ff on the interval open square bracket, 2, comma, 4, close square bracket[2,4] written in simplest form?
Solution
The average value of a function f(x) on the interval [a, b] is given by the formula:
1/(b - a) * ∫ from a to b of f(x) dx
In this case, f(x) = sin(π/2 * x), a = 2, and b = 4. So we need to compute:
1/(4 - 2) * ∫ from 2 to 4 of sin(π/2 * x) dx
This simplifies to:
1/2 * ∫ from 2 to 4 of sin(π/2 * x) dx
To compute the integral, we use the antiderivative of sin(π/2 * x), which is -2/π * cos(π/2 * x). Evaluating this from 2 to 4 gives:
1/2 * [-2/π * cos(π/2 * 4) - (-2/π * cos(π/2 * 2))]
This simplifies to:
1/2 * [-2/π * 1 - (-2/π * 0)]
Which simplifies further to:
-1/π
So, the average value of f on the interval [2, 4] is -1/π.
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