Question: Confirm that c o s ( 3 ) = c o s 3 ( ) - 3 c o s ( ) s i n

Confirm that cos(3)=cos3()-3cos()sin2().
Find an equation in rectangular coordinates (x,y) for the curve 14r=cos(3).
Confirm that c o s ( 3 ) = c o s 3 ( ) - 3 c o s

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