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Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0\[\cos \theta= \frac{\sqrt{2}}{2}\]

katrinaaap
 one year ago
Best ResponseYou've already chosen the best response.0yeah I need to solve the equation (0<theta<2pi)

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0We see that the cosine is negative. In what quadrants is the cosine negative?

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0And on your unit circle, what angle has sqrt2/2 for its cosine?

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.045 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.

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0How many radians is 45 degrees?

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0So...in quadrants II and III:

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0What is the angle meassured from the positive x axis?

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0Yes. And now for the third quadrant answer:

Mertsj
 one year ago
Best ResponseYou've already chosen the best response.0Very good. And now you have your two answers. The angles between 0 and 2 pi that have a cosine of sqrt2/2 are 3pi/4 and 5pi/4
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