Firsty i dont know what intergration at sight means, and here is the question:

By Intergrating at sight, find:

1.$\displaystyle \int x^3. ({x^4}+4)^2 $ $\displaystyle dx$

2.$\displaystyle \int \sin\theta \sqrt{1-\cos\theta}$ $\displaystyle d\theta$

3.$\displaystyle \int x.e^{x^2 + 1}$ $\displaystyle dx$

4.$\displaystyle \int e^x. (1-e^x)^3$ $\displaystyle dx$

5.$\displaystyle \int (x + 1). \sqrt{x^2 + 2x + 3}$ $\displaystyle dx$