Book: RD Sharma - Mathematics (Volume 1)
Chapter: 4. Inverse Trigonometric Functions
Subject: Maths - Class 12th
Q. No. 1 of Exercise 4.6
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1
Find the principal values of each of the following:
cot–1(–√3)
Let cot–1(–√3) = y
⇒ cot y = –√3
= – cot
= √3
= cot
= cot
The range of principal value of cot–1is (0, π)
and cot
= –√3
∴ The principal value of cot–1(–√3) is 
