1/10
Объяснение:
=sin^4x(1+5ctgx-ctg^4x)/sin^2a(2-3ctg^2x)=sin^2x(1+5*2-16)/(2-3*4)=
=sin^2x *(-5)/(-10)=(1/2)sin^2x=(1/5)(1/2)=1/10
ctg^2x=4
(1-sin^2x)/sin^2x=4
1=5sin^2x
sin^2x=1/3
1/10
Объяснение:
=sin^4x(1+5ctgx-ctg^4x)/sin^2a(2-3ctg^2x)=sin^2x(1+5*2-16)/(2-3*4)=
=sin^2x *(-5)/(-10)=(1/2)sin^2x=(1/5)(1/2)=1/10
ctg^2x=4
(1-sin^2x)/sin^2x=4
1=5sin^2x
sin^2x=1/3