Trig & Modelling YR2

Question 1

Addition formula SINE

Answer 1

sin(A+B) = sinAcosB + cosAsinB

sin(A-B) = sinAcosB - cosAsinB

Question 2

Addition formula COS

Answer 2

cos(A+B) = cosAcosB - sinAsinB

cos(A-B) = cosAcosB + sinAsinB

Question 3

Addition formula TAN

Answer 3

tan(A+B) = tanA + tanB / 1-tanAtanB

tan(A-B) = tanA - tanB/ 1+ tanAtanB

Question 4

Double angle formula SIN

Answer 4

sin2A = 2sinAcosA

Question 5

Double angle formula COS

Answer 5

cos2A =
- cos^2A - sin^2A
- 2cos^2A -1
- 1 - 2sin^2A

Question 6

Double angle formula TAN

Answer 6

tan2A = 2tanA/ 1- tan^2A