`cos(theta) = -sqrt(2)/2` Find two solutions of each equation. Give your answers in degrees (0 <= theta <= 360) and radians (0 <= theta <= 2pi)

3 Answers

nisarg's profile pic

nisarg | Student, Grade 11 | (Level 1) Valedictorian

Posted on

Sine and cosine at max are 1.  Cosine is X and Sine is Y. The values of them repeat as their graphs are waves. As you can see here 

 So here `3pi/4`   and `5pi/4`   can both equal theta

theta can be 135 degrees or it can be 225 degrees

This image has been Flagged as inappropriate Click to unflag
Image (1 of 1)
kspcr111's profile picture

kspcr111 | In Training Educator

Posted on

The above solution is right 

this is the continuation


radians the 

value of `theta = (3pi)/4 and (5pi)/4`