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welll i would tell one thing ..................
if anyone knows the place bhilai then people have got ranks ranging from 23 to5000 ...................................atleast 18-20 have qualified from my school and around 50 to 60 from bhilai

all real

@lampard and amangem ............
you are saying that ml khanna is the worst book in the market have you ever solved it completely once.....i agree that maron is good for calculus but in no way you can criticise ml khanna.it has good thinking level questions

even my vote goes to arihant its the best guide for itt jee

@lastmin
ok i got what you are trying to say .i was thinking the other way round because squaring adds another solution to the answer.sorry

squaring the solution doesnt solve the problem

the fallacy isnt solved ....you have just given the alternative solution for the problem and the way it is solved if x square is written x times and then differentiated as x is a variable answer is x why is that...please explain that to me i am still not clear with it

even i cannot get the mistake