00:01
In this question, we are given y equal to e to the power minus 2x multiplied by cos of 3x plus sine of 3x.
00:07
And we have to verify that this given function is solution of this differential equation.
00:12
So first of all, we will find d y divided by d x.
00:16
So that will be minus of 2, e to the power minus 2x, cos 3x plus sine 3x plus e to the power minus 2x.
00:27
And now that will be minus of 3 sine 3x plus 3 cos of 3x.
00:35
So now when we simplify this, we get e to the power minus 2x.
00:40
This is minus 2 cost 3x plus 3x.
00:45
So that will be cause of 3x and minus 2 sine 3x and minus 3 sine 3x will be minus of 5 sine of 3x.
00:54
So this is the value of dy divided by d x.
00:58
Now we will find d2y divided by dx square.
01:02
That means we will differentiate this again.
01:05
So we get minus 2 e to the power minus 2x.
01:08
This is cos 3x minus 5 sine 3x plus e to the power minus 2x...