Log₄36 + log₂10 -2log₂
+
=
= log₂6 + log₂10 - log₂15 +
= log₂(
) + +5= log₂4 +5 = 2+5=7
Cos135=cos(90+45)=-sin45
sin7П/12=sin105=sin(90+15)=cos15
sin(-75)=-sin75=-sin(90-15)=cos15
Х=3:4=0,75
у=2:3=0.66666667
1)(x/y^2-1/x):(1/y+1/x)
(x^2-y^2/xy^2):(x+y/xy)
(x-y)*(x+y)/xy^2 * (xy/x+y)
x-y/y