PHẦN I: ĐẠI SỐ VÀ GIẢI TÍCH
24) 3sin22x 7cos2x – 3 = 0 25) cos2x -5sinx – 3 = 0 26) cos2x+cosx+1=0 27) cot2x + (- 1)cotx - = 0 28) 3cot2(x + ) = 1 29) 4sinx – 3cosx = 5 30) 3cosx + 2sinx = 31) 3sin2x + 2cos2x = 3 32) 2sin2x + 3cos2x = sin14x 33) sin3x - cos3x = 2cosx 34) sin2x – 2sinx.cosx – 3cos2x = 0 35) sin2x – 2sin2x = 2cos2x ................
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