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Cho $y=cos^{4}\frac{x}{3}+sin^{4}\frac{x}{3}$ chu kì $\frac{k}{\pi }$. Tìm hệ số $k$


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Cho $y=cos^{4}\frac{x}{3}+sin^{4}\frac{x}{3}$ chu kì $\frac{k}{\pi }$. Tìm hệ số $k$
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Bạn chú ý gõ $\LaTeX$ cẩn thận.

Edited by xusinst, 21-02-2012 - 10:45.
$\LaTeX$ fixed





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