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Find the principal values of cot^(-1)sqr...

Find the principal values of `cot^(-1)sqrt(3)` and `cot^(-1)(-1)`

Text Solution

Verified by Experts

Let `y=cot^(-1)(-1)`
`rArr coty=-1`
`:'` The pricnipal values of `cot^(-1)x" is "(0,pi)` and in this interval `cot=(3pi)/4=-1`
`:.cot^(-1)=(3pi)/4`
`:. " The principal value of " cot^(-1)(-1)" is"(3pi)/4`
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