A) -1
B) 0
C) 1
D)
Correct Answer: C
Solution :
\[\cot (45{}^\circ +\theta )\cot (45{}^\circ -\theta )=\tan (90{}^\circ -45{}^\circ -\theta )\cot (45{}^\circ -\theta )\] \[=\tan (45{}^\circ -\theta )\cot (45{}^\circ -\theta )=1\].You need to login to perform this action.
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