Trigonometric Expression to Sum Transformation

Posted In: Mathematics
  1. $sinθ\ sinβ={cos(θ-β)-cos(θ+β)}/2$
  2. $cosθ\ cosβ={cos(θ-β)+cos(θ+β)}/2$
  3. $sinθ\ cosβ={sin(θ-β)+sin(θ+β)}/2$
  4. $tanθ\ tanβ={tanθ+tanβ}/{cotθ+cotβ}$
  5. $cotθ\ cotβ={cotθ+cotβ}/{tanθ+tanβ}$
  6. $tanθ\ cotβ={tanθ+cotβ}/{cotθ+tanβ}$

Post Tags: Trigonometry


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