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# Introduction to Trigonometry class 10 Notes Mathematics

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## CBSE Guide Introduction to Trigonometry class 10 Notes

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## 10 Mathematics notes Chapter 8 Introduction to Trigonometry

Download CBSE class 10th revision notes for Chapter 8 Introduction to Trigonometry in PDF format for free. Download revision notes for Introduction to Trigonometry class 10 Notes and score high in exams. These are the Introduction to Trigonometry class 10 Notes prepared by team of expert teachers. The revision notes help you revise the whole chapter in minutes. Revising notes in exam days is on of the the best tips recommended by teachers during exam days.

CBSE Class 10 MATHEMATICS
Revision Notes
CHAPTER 8
INTRODUCTION TO TRIGONOMETRY

• Trigonometry literally means measurement of sides and angles of a triangle.
• Positive and Negative angles: Angles in anti-clockwise direction are taken as positive angles and angles in clockwise direction are taken as negative angles.
• Trigonometric Ratios of an acute angle of a right angled triangle:
1. In a right triangle ABC, right-angled at B,
2. $sin A = \frac{{side{\text{ }}opposite{\text{ }}to{\text{ }}angle{\text{ }}A}}{{hypotenuse}}$
3. $cos A = \frac{{side{\text{ }}opposite{\text{ }}to{\text{ }}angle{\text{ }}A}}{{hypotenuse}}$
4. $\tan \,A = \frac{{side{\text{ }}opposite{\text{ }}to{\text{ }}angle{\text{ }}A}}{{side\,adjacent\,to\,angle\,A}}$
5. $\cot {\rm{A}} = {{{\rm{Hypotenuse}}} \over {{\rm{Side opposite to angle A}}}}$
6. $\sec {\rm{A}} = {{{\rm{Hypotenuse}}} \over {{\rm{Side adjacent to angle A}}}}$

$\cos ec\,A = \frac{1}{{\sin \,A}}; \ \ \ \sec A = \frac{1}{{\cos \,A}}$

$\tan \,A = \frac{1}{{\cot \,A}},\ \ \ \ \tan \,A = \frac{{\sin \,A}}{{\cos \,A}}$

$\cot {\rm{A}} = {1 \over {{\rm{tan A}}}}$, $\cot {\rm{A}} = {{\cos {\rm{A}}} \over {\sin {\rm{A}}}}$

• If one of the trigonometric ratios of an acute angle is known, the remaining trigonometric ratios of the angle can be easily determined.

(a) Find the sides of the right triangle in terms of k.

(b) Use Pythagoras Theorem and find the third side of the right triangle.

(c) Use definitions of t-ratios and substitute the values of sides.

(d) k is cancelled from numerator and denominator and the value of t-ratio is obtained.

• Trigonometric Ratios of some specified angles:

The values of trigonometric ratios for angles 0°, 30°, 45°, 60° and 90°.

 Angle A 0o 30o 45o 60o 90o sin A 0 ${1 \over 2}$ ${1 \over {\sqrt 2 }}$ ${{\sqrt 3 } \over 2}$ 1 cos A 1 ${{\sqrt 3 } \over 2}$ ${1 \over {\sqrt 2 }}$ ${1 \over 2}$ 0 tan A 0 ${1 \over {\sqrt 3 }}$ 1 $\sqrt 3$ $\infty$ cot A $\infty$ $\sqrt 3$ 1 ${1 \over {\sqrt 3 }}$ 0 cosec A $\infty$ 2 $\sqrt 2$ ${2 \over {\sqrt 3 }}$ 1 Sec A 1 ${2 \over {\sqrt 3 }}$ $\sqrt 2$ 2 $\infty$
• The value of sin A or cos A never exceeds 1, whereas the value of sec A or cosec A is always greater than or equal to 1.
• Trigonometric Ratios of Complementary Angles:

sin(90° – A) = cos A,                cos(90° – A) = sinA;

tan (90° – A) = cot A,               cot (90° – A) = tan A;

sec (90° – A) = cosec A,          cosec (90° – A) = sec A.

• Trigonometric Identities:

${\sin ^2}{\rm{A}} + {\cos ^2}{\rm{A}} = 1$

${\sec ^2}{\rm{A}} - {\tan ^2}{\rm{A}} = 1$         for 0° ≤ A < 90°,

$\cos e{c^2}{\rm{A}} - {\cot ^2}{\rm{A}} = 1$     for 0° < A ≤ 90°.

## Introduction to Trigonometry class 10 Notes

• CBSE Revision notes for Class 10 Mathematics PDF
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• Quick revision notes for CBSE board exams

## CBSE Class-10 Revision Notes and Key Points

Introduction to Trigonometry class 10 Notes. CBSE quick revision note for Class-10 Mathematics, Chemistry, Maths, Biology and other subject are very helpful to revise the whole syllabus during exam days. The revision notes covers all important formulas and concepts given in the chapter. Even if you wish to have an overview of a chapter, quick revision notes are here to do if for you. These notes will certainly save your time during stressful exam days.

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