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?

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- Mar 30th 2009, 02:08 AMmj.alawamiSolving Trigonometric equations
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? - Mar 30th 2009, 02:44 AMSoroban
Hello, mj.alawami!

I understand none of your last paragraph . . .

Quote:

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.