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##### TRIGONOMETRY FORMULAE
• sin (A+B) = sin (A)cos (B) +sin (B)cos (A)
• cos(A+B) = cos(A)cos(B) sin (A)sin (B)
• tan (A+B) = [tan (A) + tan (B)]/[1–tan (A)tan (B)]
• sin (A–B) = sin (A)cos (B)–sin (B)cos (A)
• cos(A–B) = cos (A)cos(B)+sin (A)sin (B)
• tan (A–B) = [tan (A)–tan (B)]/[1+tan (A) tan (B)]
• sin (2 A) = 2 sin (A) cos (A)
• cos (2 A) = cos2 (A) – sin2 (A)
• tan (2 A) = 2 tan (A)/[1-tan2 (A)]
• 1+ cos (2 A) = [cos2 (A) – sin2(A)] + [cos2 (A) + sin2(A)] = 2cos2(A)
• 1–cos (2 A) = [cos2 (A) – sin2 (A)] – [cos2 (A) + sin2 (A)] = 2sin2 (A)
• cos (A) = ± √ [1 + cos (2 A))/2]
• sin (A) = ± √[(1 – cos (2A))/2]
• cos (A/2) = ± √[(cos (A) +1)/2]
• sin (A/2) = ± √[(cos (A) –1)/2]
• tan (A/2) = ± √[(cos (A) –1)/(cos (A) +1)]
• tan (A/2) = ± |sin (A)|/(cos (A) +1) = ± sin (A)/(cos ...

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