To find the particular integral

[manal950]

Hi

here is question with answer

please can help me from where we got

1 + 9

and

-2+9

help me please

 

[SammyS]

Hi

here is question with answer

please can help me from where we got

1 + 9

and

-2+9

help me please

What is $\displaystyle \ \ \left(\text{D}^2+9\right)\left(Ae^x\right)\ ?$

What is $\displaystyle \ \ \left(\text{D}^2+9\right)\left(B\cos(2x)\right)\ ?$