B
be_mum_mim


Giải phương trình:
$2\sqrt{2} (sinx + cosx)cosx=3+cos2x$
$cos^4x+sin^4(x+\frac{pi}{4})=\frac{1}{4}$
$2sin15x + \sqrt{3}cos5x + sin5x = 4$
$2\sqrt{2} (sinx + cosx)cosx=3+cos2x$
$cos^4x+sin^4(x+\frac{pi}{4})=\frac{1}{4}$
$2sin15x + \sqrt{3}cos5x + sin5x = 4$
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