S
saotoivanyeu_nd


1) [tex]cos3x + sinx - 3sin2xcosx = 0[/tex]
2) [tex]sin^2x + sin^22x + sin^23x = \frac{3}{2}[/tex]
trong vog 1h phai sog giup tui 2 bai nay ko tui ngu mai ko tk dau
2) [tex]sin^2x + sin^22x + sin^23x = \frac{3}{2}[/tex]
trong vog 1h phai sog giup tui 2 bai nay ko tui ngu mai ko tk dau
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