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Q.

1(2x+1)x2x2dx=

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a

15cos14x+76x+3+c

b

15sin14x76x3+c

c

15sin14x+76x+3+c

d

15tan14x+76x+3+c

answer is D.

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Detailed Solution

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1(2x+1)x2x2dx             put  2x+1=1t2dx=-1t2dt

11t1t2t21t2t212t2dt

dtt22t+12t+2t28t2

=dt5t24t+1

=dt5352t+252

=15sin15t+23+c

=15sin152x+13+2

=15sin14x+76x+3+c

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