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
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Is there a typo?
If the second expression is , it's much easier. If , .determine: . means that lies in interval , excluding ? . . . . Right!
Square : . . . Hence: . .
Cube : .
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; August 22nd 2009 at 05:25 AM.
Reason: Deleted link to another question.
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