Question: Let Ln denote the left-endpoint sum using n subintervals and let Rn denote the corresponding right-endpoint sum. In the following exercises, compute the indicated left

Let Ln denote the left-endpoint sum using n subintervals and let Rn denote the corresponding right-endpoint sum. In the following exercises, compute the indicated left and right sums for the given functions on the indicated interval

R4 for f(x)=cos pi x

interval [0,1]

I am getting a negative 1/4 when the answer my book provides is 1/4 please help

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