1/ $sin4x - cos4x = 1 + 4(sinx - cosx)$
2/ $sinxsin2x + sin3x - 6cos^3x = 0$
Edited by Lê Xuân Trường Giang, 22-07-2011 - 20:44.
Edited by Lê Xuân Trường Giang, 22-07-2011 - 20:44.
Edited by together1995, 22-07-2011 - 21:36.
$sinx.sin2x + sin3x = 6.cos^3(x)$2/ $sinxsin2x + sin3x - 6cos^3x = 0$
0 members, 1 guests, 0 anonymous users