問題一覧
1
Sin 0
0
2
Sin 30
½
3
Sin 45
1/√2
4
Sin 60
√3/2
5
Sin 90
1
6
Cos 0
1
7
Cos 30
√3/2
8
Cos 45
1/√2
9
Cos 90
0
10
Tan 0
0
11
Cos 60
½
12
Tan 30
1/√3
13
Tan 45
1
14
Tan 60
√3
15
Tan 90
N.D
16
Cot 0
N.D
17
Cot 30
√3
18
Cot 45
1
19
Cot 60
1/√3
20
Cot 90
0
21
Sec 0
1
22
Sec 30
2/√3
23
Sec 45
√2
24
Sec 60
2
25
Sec 90
N.D
26
Cosec 0
N.D
27
Cosec 30
2
28
Cosec 45
√2
29
Cosec 60
2/√3
30
Cosec 90
1
31
What are the 3 equations of trigonometry?
sin² + cos² = 1. sec² + tan² = 1. cosec ² + cot² = 1
32
Sin
p/h
33
Cos
b/h
34
Tan
p/b
35
Cot
b/p
36
Sec
h/b
37
Cosec
h/p
38
Unique solution
a1/a2 ≠ b1/b2
39
Parallel lines = no solution = inconsist
a1/a2 = b1/b2 ≠ c1/c2
40
Infinite solutions = consist = coincident line
a1/a2 = b1/b2 = c1/c2
41
α + β
-b/a
42
α β
c/a
43
Mean
x = £fx/£f
44
Mode
l1 = (fm - f0/2f1 - f0 - f2) x h
45
Median
l + (n/2 - cf/f) x h
46
Distance formula
√(x2 - x1)² x (y2 - y1)²
47
Ratio in the form of x
x = m1y2 + m2y1/m1 + m2
48
Ratio in the form of y
y = m1y2 + m2y1/m1+m2
49
Formula to find roots of the equations
-b ± √b² - 4ac/2a