CHƯƠNG I HÀM SỐ LƯỢNG GIÁC VÀ
a. cos3x – cos4x + cos5x = 0 b. sin7x – sin3x = cos5x c. cos5x.cosx = cos4x d. sinx + 2sin3x = - sin5x e. 2tanx – 3cotx – 2 = 0 f. sin2x – cos2x = cos4x g. 2tanx + 3cotx = 4 h. cosx.tan3x = sin5x ................
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