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37. cos2x + 2cosx — 3 = O 40. 2cos2x + 5cosx + 2 = O 35. 38. o 36. 2sin2x-1=O 39. 2sin2a + Sina — I = 42. 4sin-xcotx — 3cotx = o o 2csc-x — 5cscx + 2 cosxtan x = 3cosx . Identities to solve Equations the equation on interval 10. e Equations cosx 1 0 sin20 — sec2r {O. 47. 2cotx esc x 50. Sino — 0 sinx ................
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