11cross multiply and solve
it will make life a bit easier
but who the hell on this EARTH asked u 5th derevative
but if u have a better method then post!
find the fifth derivative of y= 1/(1+x2)
please give a good method ...not the tedious one !!
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9 Answers
11
1now what is that??
actually i have just now started this chapter ..,, it's been a couple of classes
1how does cross multiplying help??
mam always gives some or the other kind of tricky questions ....i don't know what's the trick here
1c
y(1+x^2) =1
so
difrentiating y keepin d othr constant
then difrntating d othr aprt keepin y constant
dy/dx (1+x^2) +2x y =0
diff again
do this 5 tyms :)
1hehe dude rohanjiii dis fifth derivative and all doesnt come for any exams..........maximum which came is third derivative,........or often second derivative problems are asked for any competitive exams.........for ur information...........
1i have a better way .....1+x2=x2-i2 i =√-1 ,
(x+i)(x-i)
1/(x+i)(x-i) =y
now let y= A/(x+i) + B/ (x-i)
we can easily calculate A and B ....which come out to be A= 1/2i and B= -1/2i
so y=(1/2i) [1/(x-i) - 1/(x+i)]
if you now differntiate it ,, it will be far more easier ....:):):):):)
