TÌM GIÁ TRỊ LỚN NHẤT VÀ NHỎ NHẤT CỦA CÁC HÀM SỐ SAU:
$a)y=\tan x+\cos x$
$b)y=3sin^{4} x + cos4x$
$c)y=2sin^{4} x + cos^{4}x$
$d)y=4x + 9pi^2/x + sin$ trên khoảng (0;+ vô  cùng )

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 04:29 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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