TO be very honest i only know the definition of cross product of two vectors but i would like to prove.........................in fact all text books just define the cross product(adsbygoogle = window.adsbygoogle || []).push({});

how can i derive it starting from the first principles i,e, i must start with something and finally arrive at the expression given below .......... anybody who can help me out with this ......

If a and b are two vectors and alpha is the angle between them

then i would like to "mathematically" "show that" "a cross b"=(mod)a* (mod)*b*sin alpha *n(cap) where n is the unit vector perpendicular to the plane containing both a and b

this is killing me every day because i have no idea about how to prove it .........

how to start proving and from where ........ this is an other big question ....

any website that gives the detailed proof or anyone here who can do it

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# Proof for cross product (please)

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