Trigonometric Half Angle Formulas

Posted In: Mathematics
  1. $sinθ/2=±√{{1-cosθ}/2}$
  2. $cosθ/2=±√{{1+cosθ}/2}$
  3. $tanθ/2=±√{{1-cosθ}/{1+cosθ}}={sinθ}/{1+cosθ}$
    $={1-cosθ}/{sinθ}=cosecθ-cotθ$
  4. $cotθ/2=±√{{1+cosθ}/{1-cosθ}}={sinθ}/{1-cosθ}$
    $={1+cosθ}/{sinθ}=cosecθ+cotθ$

Post Tags: Trigonometry


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