need help with math

Question

Find all solutions of the equation in the interval [0,2pi)

 

tan(theta)+1=0

 

Write your answer in radians in term of pi.

If there is more than one solution, separate them with commas.

Answer 1

Obtain a unit circle:

tan θ + 1 = 0

tan θ = -1

tan^-1 (-1) = 3π/4, 7π/4