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Sin (A+B)
= sinA cosB + sinB cosA
sin(A-B)
=sinA cosB - cosA sinB
Cos(A+B)
= cosA cosB - sinA sinB
Cos(A-B)
= cosA cosB + sinA sinB
tan(A+B)
= tanA + tanB / 1- tanA tanB
Tan(A-B)
= tanA - tanB / 1+ tanA tanB
Sin 2A
= 2 sinA cosA
Cos 2A
= cos² A - sin² A
Tan 2A
= 2 tanA/ 1- tan² A