L
ltk1996


1/ $8sinx = \dfrac{\sqrt{3}}{cosx} + \dfrac{1}{sinx}$
2/ $3cos^2x- sin^2x-sin2x = 0$
3/ $sin^4x+cos^4(x- \dfrac{\pi}{4}) = \frac14$
2/ $3cos^2x- sin^2x-sin2x = 0$
3/ $sin^4x+cos^4(x- \dfrac{\pi}{4}) = \frac14$
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