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If y=∑n=0∞cnx^n is a solution of the differential equation y′′+(x+1)y′−1y=0, then its coefficients cn are related...

If y=∑n=0∞cnx^n is a solution of the differential equation y′′+(x+1)y′−1y=0, then its coefficients cn are related by the equation

cn+2= _______cn+1 +______ cn .

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