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Roberto Fronteddu edited this page Apr 26, 2026 · 15 revisions

Trigonometry

  • sin(a+b)=sin(a)cos(b)+sin(b)cos(a)
  • sin(a-c)=sin(a)cos(c)-sin(c)cos(a)
  • cos(a+b)=cos(a)cos(b)-sin(a)sin(b)
  • cos(a-b)=cos(a)cos(b)+sin(a)sin(b)
  • $$cos^2(a)=(1/2) * (1+cos(2a))$$
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