Trigonometric Double Angle Formulas

Posted In: Mathematics
  1. $sin\ 2θ=2sinθ\ cosθ={2tanθ}/{1+tan^2θ}$
  2. $cos\ 2θ=cos^2θ-sin^2θ=1-2sin^2θ=2cos^2θ-1={1-tan^2θ}/{1+tan^2θ}$
  3. $tan\ 2θ={2tanθ}/{1-tan^2θ}=2/{cotθ-tanθ}$
  4. $cot\ 2θ={cot^2θ-1}/{2cotθ}={cotθ-tanθ}/2$

Post Tags: Trigonometry


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