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Note WeBWorK will interpret acos ( x ) as cos 1 ( x ) , so in order to write a times cos ( x

Note WeBWorK will interpret acos(x) as cos1(x), so in order to write a times cos(x) you need to type acos(x) or put a space between them.The general solution of the homogeneous differential equation
y+1y=0
can be written as
yc=acos(x)+bsin(x)
where a, b are arbitrary constants and
yp=e1x
is a particular solution of the nonhomogeneous equation
y+1y=2ex
By superposition, the general solution of the equation y+1y=2ex is y=yc+yp so
y=
NOTE: you must use a, b for the arbitrary constants.Find the solution satisfying the initial conditions
y(0)=1,y(0)=0
y=
The fundamental theorem for linear IVPs shows that this solution is the unique solution to the IVP on the interval The Wronskian W of the fundamental set of solutions cos(1x) and sin(1x) of the homogeneous equation is
W=

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