How can i calculate (d2y/dx2) of any function y=f(x)

Dear Chandrakesh

 meaning of d²y/dx²  is

d²y/dx²  = d/dx (dy/dx)

for example we have a function  y =  x⁴ + 20x²

now we need to find out d²y/dx² 

first find out dy/dx   

    so dy/dx = 4x³ + 40x

now for d²y/dx²  differentiate the dy/dx again

     so  d²y/dx² = d/dx ( 4x³ + 40x)

                     = 12x² +40

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