題組內容
12. (10%) Let f1 =x+a and f2 = x-a , 
, be two vectors in the vector space C[0, 1] with inner product ＜f,8＞:=
.
(a) (4%) Denote the angle between f1 and f2 by θ. Find all possible values of a2such that θ = π/4.
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12. (10%) Let f1 =x+a and f2 = x-a , , be two vectors in the vector space C[0, 1] with inner product ＜f,8＞:=.
(a) (4%) Denote the angle between f1 and f2 by θ. Find all possible values of a2such that θ = π/4.