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Q.

If ex.(2Sin3x+5Cos3x)dx=exabSin3x+cCos3x+K then a+b+c=

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answer is 26.

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Detailed Solution

I=ex.(2Sin3x+5Cos3x)dx

=2exsin3xdx+5excos3xdx

now exsin3xdx=ex10sin3x-3cos3x

eaxsinbx=eaxa2+b2[asinbxbcosbx]+c

now excos3xdx= ex10cos3x+3sin3x

eaxcosbxdx=eaxa2+b2acosbx+bsinbx

I=  ex102sin3x6cos3x+5cos3x+15sin3x

=ex1017sin3x-1cos3x

a=10, b=17, c=-1

now a+b+c=26

 

 

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