Question

candy

請問這題要怎麼算❓🙇‍♀️

1..
1
(14/ 設 cycd.cot日為1/2 -m x+1=0之二根, ER,則
1+cose 1-co.se
Store
DAL
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14.5+1
1

Answer 1

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sinθ=s, cosθ=c, cscθ=1/s, cotθ=c/s
由根與係數知 c/s^2 = 1, c = s^2 = 1-c^2 >= 0
c = (√5-1)/2
Ans. = 2/s^2 = 2/c = √5+1