1.

I : If O is the origin and if A(x_(1),y_(1)), B(x_(2), y_(2)) are two points then OA*OB*cos angleAOB=x_(1)x_(2)+ y_(1)y_(2) II. If O is the origin and if A(x_(1), y_(1)), B(x_(2), y_(2)) are two points then OA*OB * sin angleAOB=x_(1)x_(2)+y_(1)y_(2)

Answer»

only I is TRUE
only II is true
both I and II are true
NEITHER I nor II are true

ANSWER :A


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