Credit revision Q 1 What is the sine rule ?

Answer to Credit revision Q 1 a b c sinA sinb sinC = = A B C a b c

Credit revision Q 2 What three processes do you go through in order to factorise a quadratic ?

Answer to Credit revision Q 2 (i) common factor (ii) difference of two squares (iii) trinomial (put in brackets)

Credit revision Q 3 What is sin x cos x equal to ?

Answer to Credit revision Q 3 tan x

How do you solve equations of the form cosxo = - 0.8 ? (0≤x≤360) Credit revision Q 4 How do you solve equations of the form cosxo = - 0.8 ? (0≤x≤360)

Answer to Credit revision Q 4 (i) decide on the 2 quadrants (cos is -ve) (ii) ignore the sign and press INV cos to get angle (iii) work out your 2 angles

How do you find the gradient of a line joining two points ? Credit revision Q 5 How do you find the gradient of a line joining two points ?

Answer to Credit revision Q 5 m = y2 – y1 x2 – x1 A(x1,y1) B(x2,y2) x y

Credit revision Q 6 What is sin2x + cos2x equal to ?

Answer to Credit revision Q 6 1

What is the Theorem of Pythagoras ? Credit revision Q 7 What is the Theorem of Pythagoras ?

Answer to Credit revision Q 7 For ΔABC, right-angled at A, a2 = b2 + c2 A B C a c b

State the cosine rule to find a missing side Credit revision Q 8 State the cosine rule to find a missing side

Answer to Credit revision Q 8 a2 = b2+c2-2bccosA A B C a b c

eg x Credit revision Q 9 What does a fractional index number indicate? 1 -- 2

Answer to Credit revision Q 9 It means there is a root eg x = √ x 1 -- 2

State the cosine rule to find an angle Credit revision Q 10 State the cosine rule to find an angle

Answer to Credit revision Q 10 cos A = b2 + c2 - a2 2bc A B C a b c