Edited by L Lawliet, 14-08-2012 - 18:54.
Giải phương trình: $sin\frac{x}{2}sinx-cos\frac{x}{2}cos^{2}x+1=2cos^{2}(\frac{\pi }{4}-\frac{x}{2})$.
Started By rossalin, 14-08-2012 - 18:40
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