Maths Class 10 Chapter 8: Introduction to Trigonometry

Maths Class 10 Chapter 8: Introduction to Trigonometry

Important Concepts and Formulas

1.      There are 6 trigonometric ratios, i.e., sin, cos, tan, cot, sec and cosec.

2.      In right-angled triangle ABC, right-angled at B,

3.      Six trigonometric ratios are related to each other as follows:

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

5.      The values of trigonometric ratios for some specific angles such as 0°, 30°, 45°, 60° and 90° can be determined easily.

6.      The values 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.

7.      Trigonometric ratios of complementary angles are as follows:

sin (90° A) = cos A ;             cos (90° A) = sin A
tan (90° A) = cot A ;             cot (90° A) = tan A
sec (90° A) = cosec A ;         cosec (90° A) = sec A

8.      These are the trigonometric identities:

sin2 A + cos2 A = 1 ;
sec2 A – tan2 A = 1 ;   for  0° A ≤ 90°
cosec2 A = 1 + cot2 A ;   for  0° < A ≤ 90°


Please do not enter any spam link in the comment box.

  1. You can learn it from a book or register with Khan academy but it would be easier to get help from a colleague, teacher or mentor. You can also prepare maths with the help of online applications and websites. I want to share such a website with the help of which you can hire your online tutor. SmileTutor is the leading home tuition agency for parents and students looking for home tutors. There services are 100% free and we pride ourselves on successfully matching our clients with the most suitable and qualified tutors. They will provide best tutor to your child for jc math tuition. Thanks for this beneficial article.

Post a Comment
Previous Post Next Post