14 下列何者為正數？
(A)cos 240°
(B)cot120°
(C)sec(−300° )
(D)sin 260°

答案：登入後查看
統計： A(11), B(16), C(51), D(6), E(0) #2726222

詳解 (共 3 筆)

#5786843



https://www.youtube.com/watch?v=Kvoyf2b_CbU



sin是影高
cos是影長
tan是斜率
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#5786816

參考影片

https://www.junyiacademy.org/course-compare/math-high/math-11/high-school-triangle/high-school-triangle1-2/v/avyoEYOvZ98?v=avyoEYOvZ98

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#5786835
sin高度
cos長度
tan斜率
https://www.junyiacademy.org/course-compare/math-high/math-11/high-school-triangle/high-school-triangle1-2/v/RKuqew1VCVc
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