Find the particular solution that satisfies the differential equation and the in

Marvin Mccormick

Marvin Mccormick

Answered question

2021-10-29

Find the particular solution that satisfies the differential equation and the initial condition. f(x)=sinx,f(0)=1,f(0)=6

Answer & Explanation

escumantsu

escumantsu

Skilled2021-10-30Added 98 answers

Step 1
We have:  f(x)=sinx,f(0)=1,f(0)=6
We integrate  f(x)=sinx  (first) and  f(0)  (second) to obtain a generalized solution:
f(x)dx=sinxdx=cosx+C1
Step 2
Now, we are applying the initial condition f(0)=1:
cos0+C1=1
1+C1=1
C1=1+1
C1=2
So:  f(x)=cosx+2
Now, we integrate f`(x):
f(x)dx=(cosx+2)dx
=cosxdx+2dx
=sinx+2x+C2
Now, we are applying the initial condition f(0)=6:
sin0+20+C2=6
0+C2=6
C2=6
So:  f(x)=sinx+2x+6
Finaly, the particular solution is:
f(x)=sinx+2x+6
Step 3
Explanetion:
(1):f(x)=sinx
(2):sinxdx=cosx+C
(3):f(x)=cosx+2
(4):cosxdx=sinx+C
Result
f(x)=sinx+2x+6

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