[請益] 數學問題求助
有兩題希望各位幫忙
https://imgur.com/a/w135J
如附圖,該如何解釋
https://imgur.com/a/NSiq1
如附圖,非選的第二小題,我想破頭都不知如何證明,麻煩各位幫忙
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