Q
quynhan92


1, [tex]sinx^3 + cosx^3 = cos2x[/tex]
2, [tex]\frac{1}{cosx} + \frac{1}{sin2x} = \frac{2}{sin4x}[/tex]
thanh nhìu nha!
2, [tex]\frac{1}{cosx} + \frac{1}{sin2x} = \frac{2}{sin4x}[/tex]
thanh nhìu nha!
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