Definition of Trigonometry:- Trigonometry is the branch of mathematics that is concerned with calculating the angles of triangles or the lengths of their sides.
In this article we are provided the basic of trigonometry. Which are main topic in SSC Exams. 4-5 question are based on this topic in SSC Exam and in the mains of CGL 10-14 Question are asked. So, it is the important on for preparation.
First of all you have to learn that following table.
Ɵ
|
SinƟ
|
CosƟ
|
TanƟ
|
CosecƟ
|
SecƟ
|
CotƟ
|
0°
|
0
|
1
|
0
|
Not defined
|
1
|
Not defined
|
30°
|
1 / 2
|
Ö3 / 2
|
1 / Ö3
|
2
|
2 / Ö3
|
Ö3
|
45°
|
1 / Ö2
|
1 / Ö2
|
1
|
Ö2
|
Ö2
|
1
|
60°
|
Ö3 / 2
|
1 / 2
|
Ö3
|
2 / Ö3
|
2
|
1 / Ö3
|
90°
|
1
|
0
|
Not defined
|
1
|
Not defined
|
0
|
Tricky Question of Trigonometry
Q.1 Sin 1.Sin2.Sin3......................Sin180 = 0
Q.2 Cos1.Cos2.Cos3....................Cos90 = 0
Q.3 Tan1.Tan2.Tan3.....................Tan89 = 1
Q.4 Cot1.Cot2.Cot3.....................Cot89 = 1
if X + Y = 90 so
Q.5 Sec2x- Cot2y =1
Q.6 Sin2x- Sin2y =1
Q.7 Cosec2x- Tan2y =1
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