X*0.15=2.4;
x=2.4/0.15;
x=16
4Х^2-1=0
(2Х-1)(2х+1)=0
Х= 1/2
Х=-1/2
<span>Ответ: Х=1/2; -1/2</span>
<span>х^2=(х-6)^2+(х-3)^2</span>
x²=x²-12x+36+x²-6x+9
<span>x</span>²-18x+45=0
<span>D=324-4*45=144=12</span>²
<span>x1=(18+12)/2=15
x2=(18-12)/2=3
</span>
cos^6a+sin^6a=(cos^2a+sin^2a)*(cos^4a+sin^4a-cos^2asin^2a)=
=(cos^2a-sin^2a)^2+cos^2asin^2a=(cos2a)^2+1/4(sin2a)^2=
=cos4a+5/4sin^2(2a)=cos4a+5/4(1/2(1-cos4a))=cos4a+5/8-5/8cos4a=
=1/8(5+3cos4a)