$\sin 2a=\frac{-4}{5},với \frac{\pi }{2}<a<\frac{3\pi}{4}$

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi chutbuonlongtoi@gmail.com, đã hết hạn vào lúc 06-04-14 03:57 PM

Cần trả +1,000vỏ sò để xem nội dung lời giải này
chả biết đề sao nhưng mà tính thế thì nhảm quá. Mình nghĩ là phải tính cos a, tan a, cot a, thì hợp lí hơn –  cuonglapro97 05-04-14 10:43 PM

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