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}{MPLTEXT 1 0 2 "):" }}}{EXCHG {PARA 0 "" 0 "" {TEXT 200 30 "This is a library (similar to " }{TEXT 212 5 "plots" }{TEXT 200 1 ")" }{TEXT 200 37 " containing the procedure we'll need." }}{PARA 0 "" 0 "" {TEXT 200 0 "" }}}{SECT 1 {PARA 4 "" 0 "" {TEXT 214 44 "Approximati ng the value of a double integral" }}{PARA 0 "" 0 "" {TEXT 200 0 "" }} {EXCHG {PARA 0 "" 0 "" {TEXT 200 6 "The \"" }{TEXT 213 14 "Approximate Int" }{TEXT 200 100 "\" command returns the approximate integral of a \+ bivariate function. 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