18. The vectors Ā & Bare Such that
Ā + B = A - B the angle
between the two vectors is;
a. 0°
b. 60°
c. 90°
d. 180°
Answers
Answered by
7
the answer might .................................90°
(A+B).(A+B)=(A-B).(A-B)
(A.A)+(A.B)+(B.A)+(B.B)=(A.A)-(A.B)-(B.A)+(B.B)
A^2+2A.B+B^2=A^2-2A.B+B^2
2A.B=-2A.B
=0
thus cos 0 =90°
rimi46:
then what we can do?
that's your problem
Aaghar aap ko pakistani book kay baray may pata ho too please inform me
if your practice is good you need not need any other book
ok
bye
ok
Can i ask anither question
what
go ahead
Answered by
6
you can do self dot product
a+b.a+b=a-b. a-b
a.a + a.b + b.a + b. b= a.a - a. b - b.a - b. b
a² + 2ab + b²= a² - a. b. - b²
2 a. b=0
ab cos theta = 0
cos theta =90 degree
Correct
thanks
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