- x² - 2x + 15 < 0
x² + 2x - 15 > 0
(x + 5)(x - 3) > 0
+ - +
_________₀____________₀________
- 5 3
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x ∈ (- ∞ ; - 5) ∪ (3 , + ∞)
3х - 7/8 - х-3/6 = 1
2х=(7×3)/24+(3×4)/24+24/24
2х=21/24+12/24+24/24
2Х=57/24
Х=57/(24*2)
Х=57/48
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Y`=[(1-cos4x)`*sin4x-(sin4x)`(1-cos4x)]/sin²4x=
=(4sin4x*sin4x-4cos4x+4cos²4x)/sin²4x=[4(sin²4x+cos²4x)-4cos4x]/sin²4x=
=(4-4cos4x)/sin²4x=4(1-cos4x)/sin²4x=2sin²2x/(4sin²2xcos²2x)=
=1/(2cos²2x)
Ответ на фотографии.....:.