1) log2(64^(1/3)) = log2(4) = 2
2) (log4(2))^2 = (1/2)^2 = 1/4
3) log3(3^(1/8)) = 1/8 * log3(3) = 1/8
4) log2(1/8) = -3
5) 1/4 - 3 = -11/4
-2sin25sin15=-2*1/2(cos(25-15)-cos(25+15))=-(cos10-cos40)=
=-cos10+cos40
2sin27cos9=2*1/2(sin(27-9)+sin(27+9)=sin18+sin36
25\3х²-3=0
25/3x^2 3=0
25/3x^2 -3=0, х не равно о
25/3х^2 =3
25=9х^2
х^2=25/9
х=+-25/9
x1=5/3
х2=-5/3