438 Rozwiązania i odpowiedzi
DO ROZDZIAŁU VI
6.45. y' = x2(l—6x + 13x2 —12x3). 2 b
6.47. y =3ax2--^ •
6.46. y' = lSx“-2x + \. 6.48. /=--•
6.49. y' = 63x6-l5x~b + 33x
■12
6.51. */0, /»7T7=.
6.50. y' = 7x*13 —I3x91*--j"3'2
7
35
5\Jx-’ 1
1
6.53. *>0, y' = r=-3x +- ,
, -4 1
6.55. x>0, v = ,--tt— '
' 3^5 3^/x2
7
6.57. I>0. x'= — 7?
6.59. y'= 1 6jc — 3jc2 .
6.61. x/f, y' =
-9
(3x-2)2
6.63. 7*s-* + 2/0, / =
6.52.
6.54. »0.
6.56. *>0, / = -^L-14x6--L..
7V*6 4Vx3
-7
6.58. x/0, y' = jrjj-g-
6.60. y'=24x2+\Jx.
„„ _ 2 , — 20x+25
6.62. 2x2 —5x +1/O, _y = —=-
, — 3jc(21jc5+at —4)
(7xs — x + 2)2
(2jcł-5x + ir
6.64. x +x—1/0, / =
, 8jc2(2j*t — 3>
(x3+x-l)2
6.65. x/1, y' =
-4
(*-ir
— jc2+74a+7 «•««• y = z 2, ■
(x2+l)2
6.67. x/—3, x/l,/ =
4x(x-3)
(x+3)2(x-1)2
—6x(l+3x—5x3) 1
6.69. a>0, jc/1, / =
6.70. I>0, z'--
l-y/2
6.71. s' = 21 (3< + l)6 .
3\/x2(l-\/x)2 ' ‘ ’ 2Vt(lW2l)2
6.72. i/ = 5(4z2 —5z + 13)4(8z —5)
6.75 \x\>2, y' = -j
x2-4
6.76. ax2 + bx + c>0, z'-
2 ax + b
2jax2 +bx+c
6.77. t<|, / = §•
6.78. 0<I<6, s' =
1-3
6.79. y=3-
4jc
6.80. /=--
P- 1
6.82. * > 1, /= -§ •
4 /4
6.83. a*0, u' = -
\Ja2 +v2 (v-y/a2+v2) 6.84. -a<x<a, >' =
— a
(a+*)V(a+*)(a-*)
6.85. a2 —z2>0, t/ =
V(a2-z2)3
, x(*3+2)
6.88. (at— 1)(at—2)(a:—3)(jc—4)>0, z' =
2a2*
6.89. *#a, z' =
-2*2 + 10*—1J
(a2+*2)Va4-*4
6.91. u# ±1, u =
1 —\/l — i?2
-1 t
6.93. a#0, t/ =— sin — .
a a
6.95. x#0, v' = —5-cos — .
6.97. s' = 3 sin 6l.
4 sin t
cos t
r —30 cos 21
(x-3)(x-4)n/(x-1)(at-2)(x-3)(x-4)
-1
6.90. t # 1, s' =--p—, 1 —■ •
2(1 +v 0 \ f(l — 0
6.92. y'=u'vw + uv’w+uvw' .
6.94. x' = ab cos bt.
6.96. z'=4cos2*.
6.98. u' = — 5 sin i t cos4 i t
6.101. sin21^0, s' = :
sin3 f — cos3 t sin22f