Question

which of the following is true?
a. tan^-1 (1) = - cot^-1 (1)
b. tan^-1 (-1)= cot^-1 (1)
c. tan^-1 (-1) = cot^-1 (-1)
d. tan^-1 (1) = cot^-1 (-1)

Answer 1

letter c medal me if im correct

Answer 2

arctan(x) = arccot(1/x)
thus a. tan^-1 (1) = - cot^-1 (1)

Answer 3

c is also correct

Answer 4

letter a is false check it carefully yes letter c is true

Answer 5

oh sorry i missed that negative in front of the arccot
you were right its letter c