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[" 2.यदि "y=e^(x)cos x" ,तो सिद्ध कीजए क...

[" 2.यदि "y=e^(x)cos x" ,तो सिद्ध कीजए कि "],[qquad (d^(2)y)/(dx^(2))=2e^(x)cos(x+(pi)/(2))]

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