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Ch8. Introduction to Trigonometry

In this self study course, you will learn trigonometric ratios of an acute angle of a right-angled triangle. Proof of their existence (well defined); motivate the ratios whichever are defined at 0°, 90°. Values of the trigonometric ratios of 30°, 45° and 60°. Relationships between the ratios. Proof and applications of the identity sin²A + cos²A = 1. Only simple identities to be given. Trigonometric ratios of complementary angles. For further understanding of concepts and for examination preparation, practice questions based on the above topics are discussed in the form of assignments that have questions from NCERT Textbook exercise, NCERT Examples, Board’s Question Bank, RD Sharma, NCERT Exemplar etc. instead of only one book. The PDF of assignments can be downloaded within the course.

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Course Content

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Introduction and PDF

What is trigonometry and how to start trigonometry?

Right Triangles and Trigonometric Ratios

How to remember Trigonometric Ratios

Assignment – 1

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Values of Trigonometric Ratios

Values at 45°

Values at 30° and 60°

Values at 0° and 90°

How to remember values

Assignment – 2

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Before we continue

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Working with complementary angles

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Trigonometry Identities (Part 1)

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Trigonometry Identities (Part 2)

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Before we begin Assignment – 6

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Question – 9 (Method 1)

Question – 9 (Method 2)

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