Tìm điểm cực trị của các hàm số sau :
a,  $y=sin2x-x $
b,  $y=sin^2x$
c,  $y=sin\frac{x}{2}+ cos\frac{x}{2}$

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 12:43 PM

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

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