Trigo Help

Hey 308, how's your revision going.
Not too stressed I hope XP
Here's some Math Trigo Identities and Formulas to help you... ^^

sinA = cos(90^o - A) ---------- cosA = sin(90^o - A)
tanA = cot(90^o - A) ---------- cotA = tan(90^o - A)
secA = csc(90^o - A) ---------- cscA = sec(90^o - A)

sin (-A) = -sin A
cos(-A) = cos A
tan(-A) = -tan A

sin² A + cos² A = 1
tan² A + 1 = sec² A
cot² A + 1 = csc² A

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

sin(2A) = 2sinAcosA
cos(2A) = cos² A - sin² A
cos(2A) = 2cos² A - 1
cos(2A) = 1 - 2sin² A
tan(2A) = 2tanA/(1 - tan² A)

sin² A = 1/2(1 - cos2A)
cos² A = 1/2(1 + cos2A)
tan² A = (1 - cos2A)/(1 + cos2A)

sin(3A) = 3sinA - 4sin³ A
cos(3A) = 4cos³ A - 3cosA
tan(3A) = (3tanA - tan³ A)/(1 - 3tan² A)

Rsin(x+a) = Rsinxcosa + Rcosxsina
Rsin(x-a) = Rsinxcosa - Rcosxsina
Rcos(x+a) = Rcosxcosa - Rsinxsina
Rcos(x-a) = Rcosxcosa + Rsinxsina

Lastly, All the Best for your exams =)

AP