Question

If Cos x = − 1 3 , x is in 3rd quadrant find Sec2x - tan2x.​

Answer 1

Answer:

-(9+4√2)/7

Step-by-step explanation:

sec2x=-9/7

tan2x=(4√2)/7

sec2x-tan2x=-9/7-(4√2)/7

                    = -(9+4√2)/7