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Q.

4ex+6ex9ex4exdx=Ax+Blog(9e2x4)+cthenA=

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a

-3/2

b

3/2

c

-2/3

d

2/3

answer is A.

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Detailed Solution

4ex+6e-x9ex-4e-xdx=Ax+B log9e2x-4+c    different w.r.t. 'x' 4ex+6e-x9ex-4e-x=A+B(9.2e2x)9e2x-4  4e2x+69e2x-4=A+B(18.e2x)9e2x-4 4e2x+6=A(9e2x-4)+18 B e2x               =(9A+18B) e2x-4A equite constants  6=-4A  A=-32

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