ABCD

Matrix Transform

In fact, draw all your rotational matrices sideways. Your professors will love it! And then they'll go home and shrink.
( ( cos 90º sin 90º) ( -sin 90º cos 90º ) ) ( a1 a2 )t = [[The same (a1 a2)t matrix turned 90º to the right]] {{In fact, draw all your rotational matrices sideways. Your professors will love it! And then they'll go home and shrink.}}
In fact, draw all your rotational matrices sideways. Your professors will love it! And then they'll go home and shrink.