Q.
∫xlnaax/23a5x/2b3x+lnbbx2a2xb4xdx where a,b∈R+is equal to
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a
16lna2b3a2xb3xlna2xb3xe+k
b
16lna2b31a2xb3xln1ea2xb3x+k
c
16lna2b31a2xb3xlna2xb3xe+k
d
−16lna2b31a2xb3xlna2xb3xe+k
answer is D.
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Detailed Solution
I=∫xlnaax/23a5x/2b3x+lnbbx2a2xb4xdx=∫lna2xb3x6a2xb3xdx Let a2xb3x=t. Then tlna2b3dx=dt. Therefore, I=∫16lna2b3lntt2dt=16lna2b3−lntt−∫−1t2dt=−16lna2b3lnett+k=−16lna2b3lna2xb3xea2xb3x+k
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