特別角的三角函數(6)
Author: 藍邦偉  老師

30°

15°

2

1

 \sqrt{ 3 } 

2

x

 \sqrt{ 6 }+ \sqrt{ 2 }  

60°

特別角的正餘弦三角函數值(6) 15°與75°

2

1

4

 \sqrt{ 6 }+ \sqrt{ 2 }  

 \sqrt{ 6 } - \sqrt{ 2 } 

75°

O = (5.46, 1.7)
c = Circle(O, 3.0)
a: y = y(O)
A, C_1 = Intersect(c, a)
B = Rotate(A, 240.0*°, O)
D = Rotate(A, 120.0*°, O)
多邊形1, d, a_1, b = Polygon(A, B, D)
C = Intersect(a, a_1)
e = Segment(A, B)
f = Segment(B, C)
g = Segment(C, A)
h = Segment(A, D)
i = Segment(D, C)
k = Circle(A, B)
E = Intersect(k, a, 1.0)
j = Segment(E, B)
n = 1 (slider from 0 to 6, step 1)
l = Segment(E, A)
α = Angle(B, C, A)