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Ask iit jee aieee pet cbse icse state board experts Expert Question: if vecP+vecQ=vecR & vecP-vecQ=vecS,prove |R*R| +|S*S|=2(P*P+Q*Q)
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[Post New]9 Jun 2008 07:32:18 IST
    Subject: if vecP+vecQ=vecR & vecP-vecQ=vecS,prove |R*R| +|S*S|=2(P*P+Q*Q)
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swarna.dutt92 (17)

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Olaaa!! Perrrfect answer. 3  [4 rates]
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if vecP+vecQ=vecR & vecP-vecQ=vecS,prove |R*R| +|S*S|=2(P*P+Q*Q)
    
[Post New]9 Jun 2008 10:08:25 IST
    Subject: Re:if vecP+vecQ=vecR & vecP-vecQ=vecS,prove |R*R| +|S*S|=2(P*P+Q*Q)
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iitkgp_bipin (6466)

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Olaaa!! Perrrfect answer. 1102  bad job dude!! I dont approve of this answer! 1  [1582 rates]
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If we square both the equations, we get :


R2 = P2 + Q2 + 2(P.Q)


S2 = P2 + Q2 - 2(P.Q)


Adding these two we get :


R2 + S2 = 2(P2 + Q2)


 


 
Bipin Kumar Dubey
Chemical Dept.
IIT Kharagpur

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