1) Tìm nghiệm nguyên của các phương trình sau:
a/ $cos\left[ {\frac{\pi}{8}(3x-\sqrt{9x^2+160x+800})} \right]=1.$
b/ $cos\left[ {\frac{\pi}{4}(3x-\sqrt{9x^2-16x-80})} \right]=1.$
* Giải chi tiết hộ em nhé!!! 

bị xóa vì bị trùng bởi Đức Vỹ 27-10-13 02:57 PM

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

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