cho pt $cos4x = cos^{2}3x +msin^{2}x$

a) giải pt khi m =0
b) tìm m để pt có nghiệm trong khoảng (0;$\pi/12)$
bài này nghiệm thật kinh khủng zz –  gunbk92 18-03-13 02:34 PM

bị xóa vì bị trùng bởi Đức Vỹ 25-10-13 10:16 PM

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

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