The t = tan θ / 2 $ \boldsymbol{t}= \mathbf {tan}\,\,{{\boldsymbol{\theta }}/\mathbf{{2}}} $ substitution
John J. Bird · Engineering Mathematics · 2017
Why it is important to understand: The t = tan θ / 2 $ \boldsymbol{t}= \mathbf {tan}\,\,{{\boldsymbol{\theta }}/\mathbf{{2}}} $ https://s3-euw1-ap-pe-df-pch-content-public-p.s3.eu-west-1.amazonaws.com/9781315561851/68dfa506-c5cb-44dc-acc2-051e8137b6fd/content/inline-math56_2.tif"/> substitution