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# Help

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Can someone help me with this $$\int \:e^{2x}\sin \left(x\right)dx$$   , I dont  understand how $$u=e^{2x}$$  is equal $$du=2e^{2x}dx$$ step by step pleas.

Sorry  and this $$\int \:\sqrt{8+2x-x^2}\:dx$$

Jun 14, 2018