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Q.

If 4ex+6ex9ex4exdx=Ax+Blog(9ex4ex)+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

4ex+6ex9ex4exdx=Ax+Blog(9ex4ex)+C

differentiate w.r.t 'x'

4ex+6ex9ex4ex=A+B(9ex+4ex)9ex4ex

4ex+6ex=A(9ex4ex)+B(9ex+4ex)

compareexcoefs4=9A+9BA+B=49

compareexcoefs6=4A+4BA+B=32 

A=1936,B=3536CR

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