SOLUTION: Find all solutions to each equation a) cotx +1=0 b) 2 cosB+1=0

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Question 371827: Find all solutions to each equation
a) cotx +1=0
b) 2 cosB+1=0
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
a) cotx = -1, same as tanx = -1, from 0 to 2pi, the only solutions are 3pi%2F4 and 7pi%2F4.
b) The equation is the same as cosB = 1/2. From 0 to 2pi, the only solutions are 2pi%2F3 and 4pi%2F3.