1you can convert dx/dy to 1/(dy/dx) then u can easily solve
let y=f(x) be differentiable function for all x belongs to R . then which one of the following is always true :
(a) d2y/dx2 - (dx/dy)3 =0
(b) d2y/dx2+ (dy/dx).d2x/dy2 =0
(c) d2y/dx2 - (dy/dx)3 = 0
(d) none of these
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3 Answers
1hey the ans is i think (c)
its is quest from arihant objectives....
take y = x3 and then find dy/dx further find d2y/dx2
then put in the 3 options to check which 1 of them satisfies.....
THIS IS THE SHORTEST TRICK 4 ENGG EXAMS....
I DON'T KNOW THE EXACT METHOD OF SOLVING SUCH PROBLEMS