Try another version of this question
Write the product as a sum:
14cos(39v)cos(23v)=
14cos(39v)cos(23v)=
Get help:
Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Be sure your variables match those in the question
7cos(62v)+7cos(16v)