If cos x + sin x =2/3, find the value of sin(2x) I've got that the solution is: -5/9, but how do you get this?
Last edited by white_cap; November 15th 2007 at 05:54 PM.
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Hello, white_cap! If the answer is . , there must be typo . . . If , .find the value of Square both sides: . And we have: . Then: . Therefore: .
Thanks so much, you're right it should have read: if cosx + sinx = 2/3 find the value of sin2x sorry about that, and thanks for providing the awnser AND correcting my mistake
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