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2 Answers

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1) let take n=90 ====> F(n) is grater than G(n)

2)  let take n=360 ====> G(n) is grater than F(n)

these are repeating right, i mean you can't tell which one grater among them after any c>0

therefore they are non-comparable.
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When put the value of n . Then some time n^sinn is grater. Then n^cosn and some time n^cosn is grayer then n^sinn. So we can not compair them

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