Estimate I = I≈ 21 L ܗ ܢ (-3x - 10x²) dx using midpoints and n = 3 subintervals.

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Q: The general form of an antiderivative of the function f(x)=2 cos(x+π)�(�)=2 cos(�+�)  is   F(x)=

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A: Please see the below picture for detailed solution.

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