2. Find the differential and partial derivatives $f(x, y)=x^{2} \sin (2 y+1)$ 3. Find integral $\int_{1}^{2}\left(x^{2} +1 ight)^{4} x d x$ 4. Study the function and construct its graph $f(x)=\frac{x^{3}} {x^{2}-1}$ CS.VS.1369|