$1) \frac{(1+sinx+cos2x)sin(x+\frac{\Pi }{4})}{1+tanx}=\frac{1}{\sqrt{2}}cosx$
$2) \sqrt{2}sin^{3}(x+\frac{\Pi }{4})= 2sinx$
$1) \frac{(1+sinx+cos2x)sin(x+\frac{\Pi }{4})}{1+tanx}=\frac{1}{\sqrt{2}}cosx$
$2) \sqrt{2}sin^{3}(x+\frac{\Pi }{4})= 2sinx$
0 thành viên, 1 khách, 0 thành viên ẩn danh