Solve the differential equation using the method of variation of parameters.
Solve the differential equation or initial-value problem using the method for undetermined constants.
y''-4y=e^x cosx y(0)=1, y'(0)=2
y''+y'- 2y=x - sin 2x y(0)=1, y'(0)=0
y'' + y = cot x 0<x<pi/2
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