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Question

The value of cot1(1) is

A
5π4
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B
3π4
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C
π4
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D
π4
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Solution

The correct option is B 3π4
cot1(1)=πcot1(1)(cot1(x)=πcot1(x), xR)cot1(1)=ππ4=3π4

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