Find dy/dx in Exercises 45–56. dt, x > 0 46. y = Vi + ² dt 45. У sin (1³) dt 48. y = x sin (f²) dt 47. y = dt t² + 4 dt 1² + 4 49. y %3D (t + 1)1º dt 50. y = sin x |xl < = dt 51. y = 2 V1 - 0• dt dt Vi 53. y = 52. У 1 + 12 tanx rsin-'x cos t dt Vi dt 55. y = 54. y = 2* sin-' t dt 56. y =

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