By : Neha Uppal
Updated : Oct 19, 2020, 18:20
Trigonometry is one of the fundamental concepts in Mathematics. It was first taught by a Greek mathematician named Hipparchus. In Trigonometry, we study and quantify the relation between the sides and the angles of a rightangled triangle.
Trigonometry is also an important topic in most government exams and SSC exams like SSC CGL, CHSL, MTS, Steno, CPO and RRB Exams like RRB NTPC, Group D and others. For an ideal score in the SSC competitive exams, you must prepare Trigonometry well, remember the formulas, and must have sufficient practice of questions.
The functions are studied on a rightangled triangle. The diagonal or the longest length is known as hypotenuse. The other sides are called base and perpendicular.
The angle under consideration lies between base and hypotenuse. The perpendicular is opposite to the angle. Suppose ‘α’ is the angle,
Functions  Abbreviations 
Sine
 Sin 
Cosine
 Cos 
Tangent
 Tan 
Cosecant
 Cosec 
Secant
 Sec 
Cotangent
 Cot 
In Trigonometry, angles most commonly used in questions are 0°, 30°, 45°, 60°, and 90°. Here the angle is studied on a rightangled triangle. We can further calculate for 180°, 270°, 360° using the table.
Functions  0 °  30 °  45 °  60 °  90 ° 
sin(x)  0  1/2  1/√2  √3/2  1 
cos(x)  1  √3/2  1/√2  1/2  0 
tan(x)  0
 1/√3  1  √3  ∞ 
cosec(x)  ∞
 2  √2  2/√3  1 
sec(x)  1  2/√3  √2
 2  ∞ 
cot(x)  ∞  √3  1  1/√3  0

Given below are some of the most basic and important trigonometric formulas that one must remember while preparing for SSC exams. These formulae are applicable in the case of rightangled triangles only.
The key to scoring well in the Trigonometry section is:
Trigonometry is an important topic as it is featured in most examinations:
The best method to prepare Trigonometry for SSC is to study from relevant books. Some of the most popular books are:
Book Name  Author 
Lucent’s Higher Mathematics Part 2  Rishikesh Kumar 
Kiran’s SSC Mathematics – Algebra, Trigonometry, geometry, and mensuration  Think tank of Kiran publications 
BYJU'S Exam Prep is an online learning and exam preparation platform. The site caters to almost all entrance exams like the SSC CPO, SSCCGL, Railways Exam, SSC Stenographer, etc. BYJU'S Exam Prep is an excellent site for preparation as they provide students with:
Overall, BYJU'S Exam Prep helps a student from the first step and with their extensive teaching and tests. The student can score well if they study diligently.
A student spends countless hours studying so that they can score a rank in entrance exams. It is therefore important to have a clear and concise approach to preparing a topic. Since Trigonometry is a very important topic, it must be understood and prepared well.
(a)1/2
(b)1/3
(c)3
(d)2
Answer: (a)1/2
(a)1
(b)0
(c)2cos θ
(d)2sin θ
Answer: (b)0
(a)1
(b)0
(c)1
(d) 2
Correct Answer: (b)0
(a) √3/7
(b)√2/7
(c)1/√3
(d)1/√7
Correct Answer: (c) 1/√3