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1. Cos (A+B) = CosA-Cos® — Sink: SnB 2. Cos CA-B) = CosA- Coss + SinA- SinB 3. Sin (A+B) = SinA Cosa + COSA-SiInB 4. Sin (A-B) = SinA-CosB — Cosa. SinB 5+ tan (A486) = tanA + tanB 4 — tana: tans @ tan (A-8) = tana — tans i+ tanA-tanB & LeoshwosB = CosCAt+B) + Cos CA-B) @ QSinASin® = Cos CA-B) - @s (A+B) 4 LsinAtesB = Sin G+e) + Sin (A-D lor 2 Cosh: Sin® = Sin (448) — Sin CA-B) _ TRANSFORMATION FORMULA (Sum to Product) 41. Cosc+ Cosd = Cos (e+) cos KD) 12 CosC- @sdS = --2sm (C42) sin (655) = Asin mS) sin (D=<) 3. Sno +sSinD = Vin (<£) cos (ey) 4. Since — SnD = 2 sin (3) COs (=) 45. Sin2A = RSinA-cosA lo. Sin2a = tanA 4+ tané Tt. Cos2A = Cos*A- Sin7A we ik Cos 2A = ecocs27A — 4 Pr ol 19. Cos2A = {-— Qsin2A ap =Ces QA = 4— tantA 4+ tan*A Qi tan2A = AQtanh 4— tar’?A Q2. Sinsk = SSin&A — 4sin3A 23. Gog BA = Aws3a — Zacd 4. tan 3A = StanA — tana 4— 3tar2A T+ A,&, © ane angle, 68 € @onr mn 3. Sino = L ow 6) tows T A. Coso = 4 GE 2n7r \ Se Sine= -A 7 @€ gow -%h 6. Cosg9 = ~s yy o€ (20-41) 1 Ff Sine= Sind YY 6@€ m+cn’a 8 Cosp= CosK JF 8E€ Amrit n 3- tane= dana 37 6O€ nT+K ID. Sin2@= Sinrx Cos 6 = (os? fan-6 = Jang 3SO6E NTtek & COSINERULE: b = a +e7 — 2ac cOos®B a = b+ c* —2be cos e7 = & + b* — Qab cose lbeosC + C-cosB = a acosbh + beosh = C acosc + CccosaA= b 
