Indefinite Integral of $\sqrt{1+x^2}\cos^3{x}\sin^3{x}$

39 Views Asked by At

How would I go about finding the indefinite integral of $\sqrt{1+x^2}\cos^3{x}\sin^3{x}$? I'm aware that any definite integral of it that is symmetric about zero will be zero because the function is odd, but how would I go about finding its indefinite integral?