Question

Find all solutions to the equation.
cos^2(x) + 2cos x + 1 = 0
Please help me!!!

Answer 1

what did you do so far?

Answer 2

think of how do you solve an equation like this
\[x^2+2x+1=0\]

Answer 3

the principal is the same with trig

Answer 4

would it be like..
(cos x + 1)^2 = 0
cos x = -1
therefore :

x = π + 2kπ where k is any integer

Answer 5

those question marks are supposed to be pi signs that I tried to get online but you see how it is ha

Answer 6

haha
seems a good answer :)

Answer 7

wait so it's really.
pi+2kpi where k is any integer?

Answer 8

well yes :)

Answer 9

good job^_^

Answer 10

Yayyy!! Thank you!!!

Answer 11

haha welcome ^_^