If sin x + cos x = 1/3 and , determine (sin x)^3 - (cos x)^3 ! means that x lies in interval 0 and including or excluding 0 and ? I think it's excluding because if including it must be Thx
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Hello, songoku! Is there a typo? If the second expression is , it's much easier. If , .determine: . means that lies in interval , excluding ? . . . . Right! Square [1]: . . . Hence: . .[3] Cube [1]: . Therefore: .
Hi Mr. Soroban It's not typo. Finally I've figured out the answer. To find : With this, we will get Thx a lot for your great help Mr. Soroban
Last edited by mr fantastic; Aug 22nd 2009 at 06:25 AM. Reason: Deleted link to another question.
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