Question

solve this ques of jee mains
chapter → vectors​

Answer 1

Step-by-step explanation:

a+b+c

multiply by a

(a×a)+(b×a)+(c×a) ; here a×a=0

(b×a)+(c×a) ; b×a= -(c×a)

= -(c×a)+(c×a)

=0