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x' -1 0 cos 90 -sin90 x
=
y' 0 1 sin 90 cos90 y
.................................................................................................
x' -1 0 0 -1 x
=
y' 0 1 1 0 y
..................................................................................................
x' 0 1 x
= .
y' 1 0 y
...............................................................................................................
0 1 0 -1 0 1
invers = 1/-1 =
1 0 -1 0 1 0
x 0 1 x' y'
= . =
y 1 0 y' x'
y = 4 - x² substsitusi x =y' dan y = x' ke pers awal
x' = 4 - (y)²..........................pers hasil x = 4 -y