Math CentralQuandaries & Queries


Question from Alesia, a student:

How to prove Csc(A+B) = (csc A Csc B)/ (Cot A+ Cot B)

Hi Alesia,

Write all the trig expressions in terms of sine and cosine. On the left side expand sin(A + B). Simplify the right side and show it is equivalent to the left side.


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