Contact us
Choose a category below so we can get back to you as quickly as possible.
a(t)={x1,y1.z1}. b(t)={x2,y2.z2}.[座標都是t的函數]a×b=| i j k ||x1 y1 z1| |x2 y2 z2|(a×b)′=| i j k ||x1′y1′z1′|+ |x2 y2 z2 || i j k ||x1 y1 z1 |…
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.