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(t2-1)/2t (1-t2)/2t (x2-1)/2x 2t/(t2-1)
c=L/t2 c=L/(t2-t1) c=L×(t2-t1)/2 c=2×L/(t2-t1)
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
(t-1)/2t (1-t)/2t (x-1)/2x 2t/(t-1)
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
x=t2-t y=2t y-2x2=0 y+2x2=0
x=c×(t2-t1) x=c×(t2+t1) x=c×(t2-t1)/2 x=c×(t2+t1)/2
y=t2-t x=2t x2-2x-4y=0 x2+2x+4y=0
f(-2t)左移3 f(-2t)右移 f(2t)左移3 f(2t)右移
x=t2-t y=2t y-2x2=0 y+2x2=0