CHƯƠNG I HÀM SỐ LƯỢNG GIÁC VÀ

a. sinx + cosx = b. 2sinx – 5cosx = 5 c. 2cosx – sinx = 2 d. sin5x + cos5x = -1 e. 3sinx – 4cosx = 1 f. 2sin2x + sin2x = 3 g. sin5x + cos5x = cos13x h. sinx = sin3x – cosx ................
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