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Q.

 If 4ex+6ex9ex4exdx=Ax+Blog9ex4ex+C then 

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a

A=1936,B=3536,C=0

b

A=3536,B=1936,C=0

c

A=1936,B=3536,CR

d

A=3536,B=1936,CR

answer is C.

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Detailed Solution

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I=4ex+6ex9ex4exdx

4ex+6ex=A9ex4ex+Bd9ex4exdx

=A9ex4ex+B9ex+4ex

compare coefficients of ex,ex on both sides 

9A+9B=4A+B=4/9

4A+4B=6A+B=3/2

Solve A=1936 B=3536

I=19369ex4ex+35369ex+4ex9ex4exdx

=1936x+3536log9ex4ex+c

A=1936, B=3536,CR 

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