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Find the exact value of the definite integral $\int_{-1}^{2} \left(4e^{2x} - 2e^{-x}\right)\,dx$.
Mathematics 9709 · AS & A Level · Integration
Find the exact value of the definite integral $\int_{-1}^{2} \left(4e^{2x} - 2e^{-x}\right)\,dx$.