Express the Limit as a Definite Integral on the Given $$\lim _ { n \rightarrow \infty } \sum _ { i = 1 } ^ { n } \left( 6 r _ { i } \sin r _ { i } \right) \Delta r , [ 6,12 ]$$

question 59

Short Answer

Express the limit as a definite integral on the given interval. $$\lim _ { n \rightarrow \infty } \sum _ { i = 1 } ^ { n } \left( 6 r _ { i } \sin r _ { i } \right) \Delta r , [ 6,12 ]$$

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