For each of the following, compute U(f. P), L(f. P), and 20 f(x)dx, where Find out whether

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For each of the following, compute U(f. P), L(f. P), and ˆ«20 f(x)dx, where
For each of the following, compute U(f. P), L(f. P),

Find out whether the lower sum or the upper sum is a better approximation to the integral. Graph f and explain why this is so.
a) f(x) = x3
b) f(x) = 3 - x2
c) f(x) = sin(x/5)

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