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Question
100sec2(3x+6)dx
Options:
A .  13tan(36o)
B .  13tan(6o)
C .  13tan(30o)
D .  None of these
Answer: Option D
:
D
I=100sec2(3x+6)dx
Let 3x+6=u
3dx=dudx=du3
I=sec2udu3
=13tan(u)+c
I=13tan(3x+6)100
13[tan36tan6]

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