Question

sqrt 2 cos(theta)+1=0

Answer 1

can you clarify the problem is it:\[\sqrt{2\cos \theta + 1}\]

Answer 2

\[\sqrt{2} \cos \theta + 1= 0\]

Answer 3

try to get rid of the 1 that is being added on left side first.. meaning, use the opposite operation of addition.

Answer 4

after that, get rid of the sqrt 2 that is being multiplied on left side..hence, use the opposite operation of multiplication.

Answer 5

then, get the inverse cos of both sides, and refer on unit circle for the final answer..