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\dfrac{sin^{2}x-cos^{2}x+cos^{4}x}{cos^{2}x-sin^{2}x+sin^{4}x}
thanks m.n trước
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mọi giúp giúp em giải HPT
\left\{\begin{matrix} x^{3}-4y=-3 & & \\ y^{3}-4x=-3 & & \end{matrix}\right.