1.

\[\cot x-\tan x=\]   [MP PET 1986]

A. \[\cot \,2x\]
B. \[2{{\cot }^{2}}x\]
C. \[2\,\,\cot \,2x\]
D. \[{{\cot }^{2}}\,2x\]
Answer» D. \[{{\cot }^{2}}\,2x\]


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