F(x)=(3-2x)/(4x+1)=2(1,5-x)/4(x-0,25)=(1,5-x)/2(x-0,25)
(1,5-x)/4(x-0,25)<0
- + -
____________0,25__________________1,5______________
x∈(-∞;0,25)∨(1,5;+∞)
<span>(4x-1)^2-(4x-1)-12=0
16x^2-8x+1-4x+1-12=0
16x^2-12x-10=0
2(8x^2-6x-5)=0
2(8x^2+4x-10x-5)=0
2(4x*(2x+1)-5(2x+1))=0
2(4x-5)*(2x+1)=0
(</span><span>4x-5)*(2x+1)=0
</span><span>
4x-5=0 x1=5/4
2x+1=0 x2=-(1/2)
</span>
1)))))) (sinA+cosA)^2=sin²A+2sinAcosA+cos²A=1+3sinAcosA=1+sin2A
2)))))) (sinA-cosA)^2=sin²A+cos²A-2sinAcosA=1-2sinAcosA=1-sin2A.....
<span>3)))))) cos2A+2sin^2A=cos</span>²A-sin²A+2sin²A=cos²A+sin²A=1<span>......</span>