1. Credit revision Q 1
What is the
sine rule ?

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

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

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

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

6. Answer to Credit revision Q 3
tan x

7. 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≤x≤360)

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

9. 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 ?

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

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

12. Answer to Credit revision Q 61

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

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

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

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

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

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

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

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