Question:
Mark $(\sqrt{ })$ against the correct answer in each of the following:
$\int \sec ^{5} x \tan x \mathrm{dx}=?$
A. $5 \tan ^{5} x+C$
B. $\frac{1}{5} \tan ^{5} \mathrm{x}+\mathrm{C}$
C. $5 \log |\cos x|+C$
D. none of these
Solution:
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