Solve the following coupled Diferential equation: <mstyle displaystyle="true" scriptlevel="0">

Mohammad Cannon

Mohammad Cannon

Answered question

2022-06-21

Solve the following coupled Diferential equation:
d 2 x d t 2 = ( y x ) 2
d 2 y d t 2 = y x
Then find the solution x and y in terms of t .
What we have that
d 2 x d t 2 + ( d 2 y d t 2 ) 2 = 0
Now how to solve this equation.

Answer & Explanation

Belen Bentley

Belen Bentley

Beginner2022-06-22Added 28 answers

{ d 2 x d t 2 = ( y x ) 2   . . . . . . ( 1 ) d 2 y d t 2 = y x . . . . . . . . . . . . ( 2 )
From ( 2 ), x = y d 2 y d t 2 . . . . . . ( 3 )
Put ( 3 ) into ( 1 ):
d 2 d t 2 ( y d 2 y d t 2 ) = y 2 y 2 ( d 2 y d t 2 ) 2
d 2 y d t 2 d 2 y d t 2 d y d t d 3 y d t 3 ( d 2 y d t 2 ) 2 d y d t d 3 y d t 3 ( d 2 y d t 2 ) 2 y d 4 y d t 4 ( d 2 y d t 2 ) 2 + 2 y ( d 3 y d t 3 ) 2 ( d 2 y d t 2 ) 3 = ( d 2 y d t 2 ) 2
1 y d 4 y d t 4 + 2 d y d t d 3 y d t 3 ( d 2 y d t 2 ) 2 + 2 y ( d 3 y d t 3 ) 2 ( d 2 y d t 2 ) 3 = ( d 2 y d t 2 ) 2
( d 2 y d t 2 ) 3 y d 2 y d t 2 d 4 y d t 4 2 d y d t d 2 y d t 2 d 3 y d t 3 + 2 y ( d 3 y d t 3 ) 2 = ( d 2 y d t 2 ) 5
y d 2 y d t 2 d 4 y d t 4 + 2 d y d t d 2 y d t 2 d 3 y d t 3 2 y ( d 3 y d t 3 ) 2 ( d 2 y d t 2 ) 5 ( d 2 y d t 2 ) 3 = 0

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