Sin x-cos y=0 sin x=cos y sin x=cos y sin x=cos y
sin²x+cos²y=2 (sin x)²+(cos x)²=2 (sin x)²+(sin x)²=2 2sin²x=2
sin x=cosy sin x=cos y=+/-1 В решении y1= 2πk y2=π+2πk
sin²x=1 sin x=+--/-1 два корня: x1=π/2+2πk x2=3/2π+2πk
2.2-0.6х=8.8
-0.6х=8.8-2.2
-0.6х=6.6
-х=6.6:0.6
-х=11
х=-11
Х=10-3у х=10-3у x=9 x=1 Ответы (9:1/3) (1:3)
ху=3 10у-3у^2=3 y=1/3 y=3
<span>3)
m2 + -7mn + 12n2 = 0
-7mn + m2 + 12n2 = 0
-7mn + m2 + 12n2 = 0
(m + -4n)(m + -3n) = 0
4)
</span>a^2 - 5ab - 2ab + 10b^2 =
a(a - 5b) - 2b(a - 5b) =
(a - 5b)(a - 2b)