(sin 11п/4-cos13п/4)*sin(-2.5п):cos(-25п/3)=
=(sin(3/4п-сos(-3/4П))*sin(-П/2)/ cos(-П/3)=sqrt(2)*(-1)/(1/2)=-2sqrt(2)
64x+x^-1=-16
64x+1/x=-16
x не равен 0
64x^2+16x+1=0
(8x+1)^2=0
8x+1=0
8x=-1
x=-1/8
x=-0,125
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