`int_(0)^(2)int_(0)^(x)(dxdy)/(x^(2)+y^(2))`

int_(1)^(2)int_(0)^(x)(dydx)/(x^(2)+y^(2))

(b) int_(0)^(1)int_(y)^( sqrt(y))(x^(2)+y^(2))dydx

int_(0)^(a)(dx)/((ax+a^(2)-x^(2)))

int_(0)^(1)(dx)/(x^(2)-2x+2)=

int_(0)^(2)[x]dx

int_(0)^(2)[x]dx

int_(0)^(2)(x^(2)+x)dx

int_0^2 int_0^sqrt(4+x^2) (dx dy)/(4+x^2+y^2) =

int_(z=0)^(1)int_(y=0)^(z)int_(x=0)^(y)xy^(2)z^(3)dxdydz is

Property 6: If f(x) is a continuous function defined on [0;2a] then int_(0)^(2)a=int_(0)^(a)f(x)dx+int_(0)^(a)f(2a-x)dx