Точка А не принадлежит т. К. 15=-2*10+5 15/=-15
(2sin2x-sin4x)/(sin4x+2sin2x)=(2sin2x-2sin2x·cos2x)/(2sin2x·cos2x+2sin2x)=
=[2sin2x(1-cos2x)]/[2sin2x·(cos2x+1)]=(1-cos2x)/(1+cos2x)=
=(cos²x+sin²x-cos²x+sin²x)/(cos²x+sin²x+cos²x-sin²x)=
=2sin²x/2cos²x=2tg²x
(4-y-1)(4+y+1)=(3-y)(5+y)
(p-9)(p+9)
(b-1,1)(b+1,1)
(7-2+x)(7+2-x)=(5+x)(9-x)