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Q.

x3sin3xdx=

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a

x3cos3x3+3x2sin3x9+6xcos3x27227sin3x+c

b

x3cos3x33x2sin3x9+6xcos3x27+227sin3x+c

c

x3cos3x33x2sin3x96xcos3x27+227sin3x+c

d

x3cos3x33x2sin3x96xcos3x27+c

answer is A.

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Detailed Solution

x3sin3xdx

=x3.sin3xdx(3x2.sin3xdx)dx

=x3.(cos3x)33x2(cos3x3)dx

=x3cos3x3+x2cos3xdx

=x3.cos3x3+x2.sin3x32x.sin3x3dx

=x3cos3x3+3x2sin3x923[x.cos3x31.cos3x3dx]

=x3cos3x3+3x2sin3x9+29.xcos3x2sin3x27+c

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