# Let r1 and r2 be two space curves defined as follows:
r1(t) = ( t+3^1/2*sint-1/2 , 2cost-1 , 3^1/2*t-sint+3 )
r2(t) = ( 2cos(u/2) , 2sin(u/2) , -u )
show that there is a rigid motion M: R3 -> R3
s.t. r2(t) = M(r1(t)) , t€R
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是先找到一點經過平移旋轉後重疊，在證明全部嗎?
我一直在，T,N,B.T',B',N' 繞不出來
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