How do I answer these questions?

5. (1pt) Use the amount of change formula to give an approximation to V2. 6. (1pt) Find , when y = sin(x) tan(x) 7. (1pt) Find dr' dy, when y = x - x' cos(x) 8. (1pt) Find dy dr) when y = x sin(x2 + 3x) 9. (1pt) Find dy, when y = cos(er) 10. (1pt) Find , when y = In(x2 + x + 1) 11. (1pt) Find dy dx2, when y = In(ex + x2) 12. (1pt) Use implicit differentiation to find dy when x and y are defined via the following equation y sin(xy) = y2 + 2 13. (1pt) Use implicit differentiation to find when r and y are defined via the following equation x y ty = - 8