Question 1Paper 1 style · no calculator
Find the centre and radius of the circle .
Both papers print a short formulae list: the two forms of a circle's equation, the scalar product, the addition and double angle formulae, and the derivatives and integrals of sin ax and cos ax. Everything else must be learned.
| Circle | x² + y² + 2gx + 2fy + c = 0 and (x - a)² + (y - b)² = r² |
|---|---|
| Scalar product | a.b = |a||b| cos θ and a.b = a₁b₁ + a₂b₂ + a₃b₃ |
| Trigonometry | sin (A ± B), cos (A ± B), sin 2A and the three forms of cos 2A |
| Calculus | Derivatives and integrals of sin ax and cos ax |
No. Only the derivatives and integrals of sin ax and cos ax are listed; the chain rule and the power rules must be learned.
No. The addition formulae are given, and you use them to expand k cos (x - α) or k sin (x + α) and compare coefficients.