[MNR 1986; Roorkee 1975]
A) $ \log (\sec x^{3}+\tan x^{3}) $
B) $ 3(\sec x^{3}+\tan x^{3}) $
C) $ \frac{1}{3}\log (\sec x^{3}+\tan x^{3}) $
D) None of these
Correct Answer: C
Put $ x^{3}=t\Rightarrow 3x^{2}dx=dt $ .
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