A
19. y ln(x x2 a2 )
y' ln(x
x2 a2 )
'
x
1 x2
a2
x
x2
a2
'
x
1
1
1
x2
a2
2 x2 a2
x2
a2
'
x
x
1
1
1
2x
1
1
x2
a2
2 x2 a2
x
x2
a2
1
x2
a2
x2
a2
x
x2 a2
1 x2 a2
x
x2 a2
20. y 1 sin x 1 sin x
y '
1 1
sin x sin x
'
2
1 1 sin x
1 sin x ' 1 sin x
1 sin x
1 2
1 1
sin sin
x x
1
sin
x
'
1
sin x 1 sin 1 sin x2
x
1
sin
x
'
1 2
1 1
sin sin
x x
cos
x
1
sin x 1 sin x 1 sin x2
cos
x
1 2
1 1
sin sin
x x
cos
x
sin
x
cos x cos x
1 sin x2
sin x
cos
x
1 2
1 1
sin x sin x
2 cos x
1 sin x2
1 1
sin x sin x
cos x
1 sin x2
21. y ln sin 2x 1 sin 2x
sin Ax' cos AxAx' A cos Ax sin 2x' 2 cos2x
y ' ln
sin 2x 1 sin 2x
'
1 sin 2x 1 sin 2x
sin 2x 1 sin 2x
'
1 sin 2x sin 2x 2
1 sin 2x
sin 2x 1 sin 2x
'
1 sin 2x
1 2
1 sin 2x sin 2x
1 sin 2x sin 2x
2 cos 2x
1
sin 2x sin 2x 1 sin 2x2
2 cos
2x
1 2
1 sin 2x sin 2x
2 cos 2x
2 cos 2x sin 2x 2 sin 2x
1 sin 2x2
cos 2x
1 2
1 sin 2x
2 cos 2x
1 sin2x
cos 2x
sin2x 1 sin2x
cos 2x sin 2x
1
1 sin 2x
ctg2x 1 sin 2x
22. y tg x 1 tg3 x 23 2
y'
tg
x 2
1 3
tg3
x 2
'
1 cos2
x 2
x ' 2
1 3
tg
x 3 2
'
1 cos2
x 2
1 2
1 3tg2 3
x 2
tg
x ' 2
1 2 cos2
x
tg2
x 2
1 2 cos2
x
2
2
1 2 cos2
x
1
tg2
x 2
1 2 cos2
x
1
sin2 cos2
x
2 x
2
2
2
1 2 cos2
x
cos2 x sin2 2
cos2 x
x 2
1 2 cos4
x
2
2
2
23. y 1 lnsin x 1 sin2 x
2
2
y'
1 2
ln
sin
x
1 sin2 2
x
'
1 1 2 sin x
sin x'
1 2 sin x sin x'
2
cos x sin x cos x cos x 2 sin2 x cos x
2 sin x
2 sin x
cos x 1 2sin2 x cos x sin2 x cos2 x 2sin2 x cos x cos2 x sin2 x
2 sin x
2 sin x
2 sin x
cos x cos 2x 1 cos x cos 2x 1 ctgx cos 2x
2 sin x 2 sin x
2
24. y xln(x 1 x2 ) 1 x2
y'
xln(x
1 x2 )
1
x2
'
x
'
ln
x
1
x2
x
ln
x
1
x
2
'
2
1 1 x2
1 x2 '
ln
x
1
x2
x
x
1 1
x2
x
1
x2
'
2
1 2x 1 x2
ln
x
1
x2
x
x
1
1
1
x2
'
1 x2 2 1 x2
x x 1
ln
x
ln
x
1
x2
x
1
x2
x
x
1
1
2x
x
1 x2 2 1 x2 x 1
x
1
x
x
1 x2 1 x2 x 1
ln
x
ln
x
1
x2
x
x
1
x2
1 x2
x
1 x2
x x 1
1
x2
x x 1
x x
1
ln
x
1
x2
25.
y
arcsin
x2 x2
a2 a2
y'
arcsin
x2 x2
a2 a2
'
1
1
x2 x2
a2 a2
2
x2 x2
a2 a2
'
1
1
x4
2x2a2 x2 a2
2
a4
x2 a2
'
x2 a2 x2 a2 x2 a2 2
x2 a2 '
1 x4 2a2x2 a4 x4 2x2a2 a4
2x
x2 a2 x2 a2 x2 a2 2
2x
x2 a2
4x2a2
2
2x3
2xa2 2x3 2xa2 x2 a2 2
x2 a2 2
x2 a2 2xa
4xa2 x2 a2
2
2a x2 a2
26. y x 1 ln(1 x 1)
'
y' x 1 ln(1 x 1)
1
x 1'
1
' 1 1 x
2 x 1
1 x 1
2
1 1 x 1 1
1 x
1
0
2
1 x
1
x
1'
2
1 x 1 1
1
x
1
2
1 x 1
1
2
1 x 1 2
1 x 1 1
x 1
1 x 1 1
x 1
1
2 x 1 1 x 1 2 x 1 1 x 1 2 1 x 1
27. y ln2 x lnln x
y ' ln2 x lnln x 2ln x ln x' 1 ln x' 2ln x 1 1 1
ln x
x ln x x
1 x
2
ln
x
1 ln x
1 x
2ln2 ln
x x
1
2ln2 x 1 x ln x
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