Question

cos theta= - square root 2 divided by 2

Answer 1

\[\cos \theta= -\frac{\sqrt{2}}{2}\]

Answer 2

yeah I need to solve the equation (0<theta<2pi)

Answer 3

We see that the cosine is negative. In what quadrants is the cosine negative?

Answer 4

2 and 3

Answer 5

And on your unit circle, what angle has sqrt2/2 for its cosine?

Answer 6

-45

Answer 7

45 does have that cosine ut we said we would be in quadrants II and III where the cosine is negative. Also you said your answer had to be between 0 and 2 pi so I think you should give the answer in radians.

Answer 8

How many radians is 45 degrees?

Answer 9

45 degrees is pi/4

Answer 10

So...in quadrants II and III: