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(x-2y)(2y+x) (-2y-x)(x+2y) (x-2y)(-x-2y) (2y-x)(-x-2y)
(x+2)(x+2) (-x+y)(x-y) (2x-y)(2x+y) (-x-y)(x+y)
(x﹣2y)(2y+x) (﹣2y﹣x)(x+2y) (x﹣2y)(﹣x﹣2y) (2y﹣x)(﹣x﹣2y)
p=(y1+y2-a)/2 p=a+y1-y2 p=(a+y1-y2)/2 p=(a+y2-y2)/2
y=cos 2x y=-sin 2x y=sin y=sin
G90G03X22Y58I8J-18F100 G90G03X22Y58I-18J8F100 G90G03X22Y58I30J40F100 G90G03X22Y58I18J-8F100
(x-2y)(x+2y) (-2y-x)(x+2y) (x-2y)(-x-2y) (2y-x)(-x-2y)
x2+y2 ﹣x2﹣y2 x2+4xy+4y2 x2+xy+y2
(2a+b)(2a-3b) (x-2y)(x+2y) (x+1)(1+x) (-x-y)(x+y)
﹣x2+y2 ﹣x2﹣y2 x2﹣2xy+y2 x2+y2
-x2+16y2 81(a2+b2-2ab)-(a+b)2 m2- -x2-y2