Cho hàm số $y=\cos \frac{x}{2}+x\sin \frac{x}{2}$. Tìm x thỏa mãn ${y}'+{y}''= \cos \frac{x}{2}$
Cho hàm số $y=\cos \frac{x}{2}+x\sin \frac{x}{2}$. Tìm x thỏa mãn ${y}'+{y}''= \cos \frac{x}{2}$
Started By ironman, 21-04-2013 - 15:53
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