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The function u=e^x sin x ; v=e^x cos x s...

The function `u=e^x sin x ; v=e^x cos x` satisfy the equation a.`v(d u)/(dx)-u(d v)/(dx)=u^2+v^2` b. `(d^2u)/(dx^2)=2v` c. `(d^2v)/(dx^2)=-2u` d. `(d u)/(dx)+(d v)/(dx)=2v`

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