C4

Question 1

When working out partial fractions, how do you cancel the brackets?

Answer 1

Multiply A by the denominator of f(x) and then cancel, same with B and C

Question 2

Implicitly differentiate xy?

Answer 2

1) differentiate y multiply by x, since y is diff. add dy/dx on the end
2) differentiate x multiply by y

xy -> x(dy/dx) + y