FUNDAMENTAL TRIG IDENTITIES
TRIGONOMETRY FORMULAS
Sum and Difference Formulas
sin ( u + v ) = sin u cos v + cos u sin v
sin ( u – v ) = sin u cos v – cos u sin v
cos ( u + v ) = cos u cos v – sin u sin v
cos ( u – v ) = cos u cos v + sin u sin v
tan ( u + v ) = [pic] tan ( u – v ) = [pic]
Double Angle Formulas Half-angle Formulas
sin 2u = 2 sin u cos u [pic]
cos 2u = cos2 u – sin2 u [pic]
= 2cos2 u – 1
= 1 – 2sin2 u
tan 2u = [pic] [pic]
[pic]
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