Find all the vlaues of x in that are solutions of the equation:
Attempt:
Since cosine is negative in the 2nd and 3rd quadrant
2nd quadrant
180-120=60
x=120 degrees
3rd quadrant
No solution
Is my attempt correct?
Hello, mj.alawami!
I understand none of your last paragraph . . .
Find all the vlaues of x in that are solutions of the equation:
Attempt:
Since cosine is negative in the 2nd and 3rd quadrant
2nd quadrant
180 - 120 = 60
. . . . . . . . . . ??
x = 120°
3rd quadrant
No solution
We have: .
Then: .
Hence: .
Therefore: no solutions.