Maths

Let \displaystyle \int_{5}^{9.5} f(x) dx =4, \ \int_{5}^{6.5} f(x) dx=5, \ \int_{8}^{9.5} f(x)dx =8

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1. what do you want? The integral from 6.5 to 8? That would be 4-5-8 = -9

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