При а=-5
1)B=5-4=1
2)b=|5-5|=0
При а =0
1)b=0-4=-4
2)|5-0|=5
при а =4
1)b=4-4=0
2)|5-4|=1
(х-10)/х-15 = 2
х-10 = 2(х-15)
х-10 = 2х-30
х-2х = -30+10
-х = -20
х = 20
-38х+15=-21х-36-38х+21х=-36-15-17х=-51х=-51:(-17)х=3у=-38•3+15у=-99Точка пересечения (3;-99)
<span>y+3 3/14= -1 4/21
у = </span>-1 4/21 - 3 3/14
у= - 4 17/42
-4 17/42 + 3 3/14 = - 14/21
-4 17/42 + 3 3/14 = - 25/21-45/14=-50/42-135/42=-185/42=-14/21
Cosx+cos3x=cos2x
2cos((x+3x)/2)*cos((x-3x)/2)=cos2x
2cos2xcosx-cos2x=0
cos2x (2cosx-1)=0
cos2x=0 ili 2cosx-1=0
2x=pi/2 + пn cosx=0.5
x = п/4 + пn/2, x= ±п/3 +2пn, n∈Z