The auxiliary equation of ordinary differential equation with

Landin Harmon

Landin Harmon

Answered question

2022-04-02

The auxiliary equation of ordinary differential equation with constant coefficients corresponding to
(x2D2+xD+1)y=sin(2logx)sin(logx) is ?
I was trying to derive the answer for more than an hour but please help me to get the solution to this problem Thankyou in advance

Answer & Explanation

anghoelv1lw

anghoelv1lw

Beginner2022-04-03Added 19 answers

Step 1
The equation can be written as
x2y(x)+xy(x)+y(x)=sin[2log(x)]sin[log(x)].
Let
y(x)=z[log(x)],,
hence
xy(x)=z[log(x)]
and
x2y(x)=z[log(x)]z[log(x)].
Therefore,
z[log(x)]z[log(x)]+z[log(x)]+z[log(x)]=z[log(x)]+z[log(x)]=sin[2log(x)]sin[log(x)],
which implies
z(x)+z(x)=sin(2x)sin(x).
You can solve this equation for z, and then solve it for y by noting that y(x)=z[log(x)].
The former is much simpler to solve.

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