Jawabanmu

2014-06-07T12:54:27+07:00
R(0,45)
dimana y=-x memetakan (3,4) jadi (-4,-3)
sehingaa R(0,45)=(-4. cos 45 - (-3)sin 45, -4 sin 45+ (-3) cos 45)
=(-4(1/2√2) + 3(1/2√2), -4 (1/2 √2) - 3 (1/2 √2))=-2 √2+3/2 √2, -2√2-3/2√2)
=(-1/2 √2, -7/2 √2)

2014-06-07T13:10:44+07:00
R(0,45)
y=-x memetakan (3,4) = (-4,-3)
R(0,45) = (-4 . cos 45 - (-3)sin 45, -4 sin 45+ (-3) cos 45)
=(-4(1/2√2) + 3(1/2√2), -4 (1/2 √2) - 3 (1/2 √2))
=-2 √2+3/2 √2, -2√2-3/2√2)
=(-1/2 √2, -7/2 √2)