每週一題102.04.24

 

設f(x)=2sinx+cosx。若90°<a<180°，90°<b<180°，且滿足f(a)=1，f(b)=0，求cos(b-a)=?

﹝出自瑞華文化出版社﹞

Date Posted: 18 Apr 2013 @ 02 18 PM
Last Modified: 18 Apr 2013 @ 02 36 PM
Posted By: hs_math
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