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Solve the differential equation or initial value problem using the method for undetermined constants and variation of parameters.

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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