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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Dec 2007 09:46:29 IST
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if xsin3A + ycos3A= sinA and xsinA - ycosA =0 prove that x2 + y2 =1.
pls help me ...
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22 Dec 2007 10:26:43 IST
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this question is wrong....if u put some value of A then u are not getting x^2+y^2=1.....infact getting different answers for different values of A
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22 Dec 2007 11:23:13 IST
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on solving above 2 equations....by eliminating A,
answer comes out to be either x = 1 or y = 0,
but not x^2 + y^2 =1
so, locus of pt of intersection may be a st line........but definitly not a circle...............
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LOKESH SARDANA,
department of Production and Industrial engineering,
Indian Institute of Technology,Roorkee.
Happiness can be found, even in the darkest of times, if one only remembers to turn on the light.
Albus Dumbledore
Harry Potter and the Prisoner of Azkaban movie
There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.
-- Albert Einstein
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22 Dec 2007 11:25:34 IST
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yes i too was saying this only
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22 Dec 2007 16:42:15 IST
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I GOT DA ABOVE MENTIONED QUESTION FROM THE FIITJEE RSM ...................................................
DOES DAT HAV MISTAKE????
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22 Dec 2007 17:09:53 IST
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xsinA=ycosA...........
substituting this in the other equation, we get,
xsin3A+xsinAcos2A = sinA
xsinA(sin2A+cos2A)=sinA
x=1......
similarly,
y = tanA.........
so,
x2+y2=1 will be true only for a few values of A where tanA is 0...!!
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The inevitable truth of life.....everyone in our life is going 2 hurt sooner or later......u just have 2 realise who is worth.....
the PAIN or the PERSON...!!! |
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