A) \[-1\]
B) \[0\]
C) \[1\]
D) \[2\]
Correct Answer: C
Solution :
\[\cot 15{}^\circ .\,\cot \,20{}^\circ .\,\cot 70{}^\circ .\,\cot 75{}^\circ \] \[=\cot \,(90{}^\circ -75{}^\circ ).\,\,\cot \,20{}^\circ \,.\,\,\cot \,\,(90{}^\circ -20{}^\circ ).\,\cot \,75{}^\circ \] \[=\tan 75{}^\circ .\cot 20{}^\circ .\tan 20{}^\circ .\cot 75{}^\circ =\] \[=\,\,\,\]You need to login to perform this action.
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