Simplify and Write Restrictions of Product and quotient of Rational Functions

a. (a^2-1)/(1+b)×(1-b^2)/(a^2+a)÷(b^3-b)/a
b. (x^2-y^2)/(4x^2-y^2 )÷(2x+3y)/(4x^2+8xy+3y^2 )×x/(x+y) #GCSE #SAT #EQAO #IBSLmath