I : If cos x + cos y=1/3 , sin x+sin y=...

I : If ` cos x + cos y=1/3 , sin x+sin y=1//4 " then " cos (x+y)=7//25`
II : If `cos x + cos y=1//3 , sin x + sin y=1//4 " then " sin(x+y)=24//25`

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