Maths-compound and double angles formulae

Maths and the formulae for double and compound angles

sin(A + B)

sinAcosB + cosAsinB

sin(A - B)

sinAcosB - cosAsinB

cos(A + B)

cosAcosB - sinAsinB

cos(A - B)

cosAcosB + sinAsinB

tan(A + B)

tanA + tanB/1 - tanAtanB

tan(A - B)

tanA - tanB/1 + tanAtanB

sin2A

2sinAcosA

cos2A

2cos²A - 1 = 2cos²A - 2sin²A = 2 - 2sin²A

tan2A

2tanA/1 - tan²A