Question: how to solve two integral together?

if i solved two integral seperately..it solved.. but i can't solve together..what's wrong...please help

restart

"al_eq:=`D__11`*(∫)[0]^(a)((ⅆ)^2)/((ⅆ)^( )x^2) A*((ⅆ)^2)/((ⅆ)^( )x^2) A ⅆx (∫)[0]^(b)B*B ⅆy;"

Error, invalid product/quotient

"al_eq:=`D__11`*(∫)[0]^a((ⅆ)^2)/((ⅆx)^2) A*((ⅆ)^2)/((ⅆx)^2) A ⅆx (∫)[0]^bB*B ⅆy;"

 

``

B^2*b

(1)

``

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