Question: A function is defined over an interval [a, b]. (a) Graph indicating the area A under from a to b. (b) Approximate the area A

A function is defined over an interval [a, b].

(a) Graph indicating the area A under from a to b. 

(b) Approximate the area A by partitioning into four subintervals of equal length and choosing u as the left endpoint of each subinterval. 

(c) Approximate the area A by partitioning into eight subintervals of equal length and choosing u as the left endpoint of each subinterval. 

(d) Express the area A as an integral. 

(e) Use a graphing utility to approximate the integral.

f(x) = cosx, [0, π/2]

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