### Trigonometric Ratios of complementary angles are

- sin (90° − θ) = cos θ
- cos (90° − θ) = sin θ
- tan (90° − θ) = cot θ
- cot (90° − θ) = tan θ
- sec (90° − θ) = cosec θ
- cosec (90° − θ) = sec θ

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Last updated at May 29, 2018 by Teachoo

- sin (90° − θ) = cos θ
- cos (90° − θ) = sin θ
- tan (90° − θ) = cot θ
- cot (90° − θ) = tan θ
- sec (90° − θ) = cosec θ
- cosec (90° − θ) = sec θ

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Trignometric ratios of complementry angles

What is sin (90 - A) cos (90 - A) equal to?
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Example 9 Not in Syllabus - CBSE Exams 2021

Ex 8.3, 1 Important Not in Syllabus - CBSE Exams 2021

Ex 8.3, 2 Important Not in Syllabus - CBSE Exams 2021

Ex 8.3, 7 Not in Syllabus - CBSE Exams 2021

Example 11 Important Not in Syllabus - CBSE Exams 2021

Ex 8.3, 4 Not in Syllabus - CBSE Exams 2021

Example 10 Important Not in Syllabus - CBSE Exams 2021

Ex 8.3, 3 Not in Syllabus - CBSE Exams 2021

Ex 8.3, 5 Important Not in Syllabus - CBSE Exams 2021

Ex 8.3, 6 Important Not in Syllabus - CBSE Exams 2021

Chapter 8 Class 10 Introduction to Trignometry

Concept wise

- Finding sin cos tan
- Finding sin cos when sides of a triangle are given
- Finding ratios when other ratios are given
- Finding values of expressions
- Proving
- Trignometric ratios of Specific Angles - Evaluating
- Trignometric ratios of complementry angles
- Expressing ratios in other ratios
- Evaluating using Trignometric Identities

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.