Question

Find all solutions to the equation. cos x = -1/2

Answer 1

please help

Answer 2

help please

Answer 3

You will need to solve for sin(x)=cos(x) between 0 and 2pi.
The same solution will be valid if you add 2k pi to the obtained solution.

Are you able to find the solution between 0 and 2pi?

Answer 4

make sense?

Answer 5

what i had gotten was 5pi/6 + npi
n=0+-1,2

Answer 6

i was wondering if i was right

Answer 7

ohh so 2pi/3

Answer 8

Wait sorry ...... you are correct a got messed up.SORRY

Answer 9

it should be pi/4 +2npi and 5pi/4 + 2npi

Answer 10

ohh i had gotten it correct thank you ...i also have another question

Answer 11

sure

Answer 12

Find the exact value by using a half-angle identity.

cos (pi/12)

Answer 13

for that one i got