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Question

[cosxxsinxlogx]dx=
  1. (logx)(cosx)+c
  2. (logx)sinx+c
  3. 2(logx)(cosx)+c
  4. (logx)sinx+c

A
(logx)(cosx)+c
B
(logx)sinx+c
C
2(logx)(cosx)+c
D
(logx)sinx+c
Solution
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[cos xxsinx log x]dx
cos xxdx sin x log x dx
cos x 1x dx+ sin x log x. dx sin x log x dx.
=( cos x)(log x)+c
Hence, [cosxx(sin x)(log x)]dx=( cos x)( log x)+c

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