SOLUTION: cos(120) +cos(30)
Using the product to sum formula
Algebra.Com
Question 945993: cos(120) +cos(30)
Using the product to sum formula
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!
you are supposed to express as and change it to single angles with the standard formula
= ........since , , we have
=
=
=
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