WolframAlpha won't recognize my second derivative

WolframAlpha won't recognize my second derivative

I have been trying to calculate my derivative in WolframAlpha by inputing
this:
A=0.921/10^(9),
a=1*10^(-9),
h=1.055*10^(-34),
m=9.109*10^(-31)
int_((-pi)/(2*a))^((pi)/(2*a)) A
cos^2(x/a)*(-h^2/(2*m))*d^2/dx^2(A*cos^2(x/a))dx
Well what I got was a wrong interpretation and therefore a weird result. I
have noticed that if I only remove the second derivative like this:
A=0.921/10^(9),
a=1*10^(-9),
h=1.055*10^(-34),
m=9.109*10^(-31)
int_((-pi)/(2*a))^((pi)/(2*a)) A cos^2(x/a)*(-h^2/(2*m))dx
The interpretation looks fine but is missing a second derivative. Why
isn't the second derivative recognized? How can I fix this? If it can't be
fixed could anyone please calculate this in Mathematica?