13. If x = Cos0+ Cos 20 and y = Sine+ Sin20. Show that: i) xy 2xx= Cos 20+ 2Cos 30+ Cos40 Sin 2A+ 2 Sin 3A + Sin48

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A: Please see the attachment .Explanation:

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A: ​cos(2α)=−1,43​​Explanation:Step 1:​Given: 2cos(3α)=cosαTo find: cos(2α)​Step 2:​2cos(3α)=cosαUsing…