Angle CED = X = 75°

表达式17: "B" Subscript, 2 , Baseline equals "O" Subscript, 2 , Baseline

equals

表达式18: "C" Subscript, 1 , Baseline equals "R" cosine "B" Subscript, "O" "C" , Baseline

equals

4.5

表达式19: "C" Subscript, 2 , Baseline equals "R" sine "B" Subscript, "O" "C" , Baseline

equals

7.7 9 4 2 2 8 6 3 4 0 6

表达式20: "m" Subscript, 1 , Baseline equals tangent "B" Subscript, "A" "C" , Baseline

equals

0.5 7 7 3 5 0 2 6 9 1 9

表达式21: "m" Subscript, 2 , Baseline equals tangent left parenthesis, 180 minus "A" Subscript, "B" "D" , Baseline , right parenthesis

equals

negative 0.2 6 7 9 4 9 1 9 2 4 3 1

表达式22: "y" equals "m" Subscript, 1 , Baseline left parenthesis, "x" minus "A" Subscript, 1 , Baseline , right parenthesis

表达式23: "y" equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesis

表达式24: "m" Subscript, 1 , Baseline left parenthesis, "x" minus "A" Subscript, 1 , Baseline , right parenthesis equals "m" Subscript, 2 , Baseline left parenthesis, "x" minus "B" Subscript, 1 , Baseline , right parenthesis

表达式25: "D" Subscript, 1 , Baseline equals StartFraction, "m" Subscript, 1 , Baseline "A" Subscript, 1 , Baseline minus "m" Subscript, 2 , Baseline "B" Subscript, 1 , Baseline Over "m" Subscript, 1 , Baseline minus "m" Subscript, 2 , Baseline , EndFraction

equals

negative 3.2 9 4 2 2 8 6 3 4 0 6

表达式26: "D" Subscript, 2 , Baseline equals "m" Subscript, 1 , Baseline left parenthesis, "D" Subscript, 1 , Baseline minus "A" Subscript, 1 , Baseline , right parenthesis

equals

3.2 9 4 2 2 8 6 3 4 0 6

表达式27: "E" Subscript, 1 , Baseline equals "B" Subscript, 1 , Baseline plus StartFraction, "A" Subscript, "D" , Baseline Over "B" Subscript, "C" , Baseline , EndFraction left parenthesis, "C" Subscript, 1 , Baseline minus "B" Subscript, 1 , Baseline , right parenthesis

equals

5.7 0 5 7 7 1 3 6 5 9 4

表达式28: "E" Subscript, 2 , Baseline equals "B" Subscript, 2 , Baseline plus StartFraction, "A" Subscript, "D" , Baseline Over "B" Subscript, "C" , Baseline , EndFraction left parenthesis, "C" Subscript, 2 , Baseline minus "B" Subscript, 2 , Baseline , right parenthesis

equals

5.7 0 5 7 7 1 3 6 5 9 4

Graphs

表达式30: polygon left parenthesis, "B" , "D" , right parenthesis

表达式31: polygon left parenthesis, "D" , "E" , right parenthesis

表达式32: left parenthesis, "R" cos "t" , "R" sin "t" , right parenthesis

定义域t最小值：

less than or equal to "t" less than or equal to

定义域t最大值： 180

表达式33: polygon left parenthesis, "A" , "B" , "C" , right parenthesis

Points

技术支持

30°

15°

45°