Ответ:
y=e^x•cos x. y`=(e^x)`•cos x +e^x(cos x)'=e^x•cosx-sin x•e^x =e^x(cos x -sin x)
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Ответ:
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Ответ:
y=e^x•cos x. y`=(e^x)`•cos x +e^x(cos x)'=e^x•cosx-sin x•e^x =e^x(cos x -sin x)