1.

\[\int{\text{cose}{{\text{c}}^{4}}x\,dx}=\]          [RPET 2002]

A.            \[\cot x+\frac{{{\cot }^{3}}x}{3}+c\]
B.            \[\tan x+\frac{{{\tan }^{3}}x}{3}+c\]
C.            \[-\cot x-\frac{{{\cot }^{3}}x}{3}+c\]
D.   \[-\tan x-\frac{{{\tan }^{3}}x}{3}+c\]
Answer» D.   \[-\tan x-\frac{{{\tan }^{3}}x}{3}+c\]


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