Question

Which of the following is equivalent to tan^-1(-1)?

Answer 1

Answer:

Step-by-step explanation:

$tan^{-1)(-1)=x say\\tanx=-1=-tan \frac{\pi}{4} =tan(\pi -\pi /4),tan(2\pi -\pi /4)\\x=\frac{3 \pi }{4} ,\frac{7 \pi }{4}$

Answer 2

Answer:

-pi/4

Step-by-step explanation: