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A step by step breakdown and explanation would be much appreciated please! 

 

 
UpTheChels  Nov 14, 2017
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You have to find cos(x) from sin(x) =4/5, which would be:cos(x) =3/5. Then;

You have to find cos(y) from sin(y) =5/13, which would be:cos(y) =12/13. Then:

You have to use this formula: sin(x + y) = sin x cos y + cos x sin y=4/5*12/13 + 3/5*5/13 =63/65 

 
Guest Nov 15, 2017

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