Answers

2016-06-22T09:01:52+08:00
(a+b+c)² =a²+b²+c²+2ab+2bc+2ac (r-t+n)² =r²+t²+n²-2rt-2nt+2nr
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2016-06-26T21:00:31+08:00
R2+t2+N2+2RT+2NR+2NT
0
ITS wrong, what i meant is r2+t2+N2-2RT-2NR+2NT..sorry for the error
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