Class 11 Maths L3 Trigonometric Functions

Look in the mirror. That’s your competition.

Lecture - 3 Chapter 3 Trigonometric Functions

Basics of unit circle in trigonometry

Signs of trigonometry ratios in different quadrants and at different angles

Shortcut trick to remember signs of trigonometry ratios in different quadrant

NCERT Exercise 3.2

Find the values of other five trigonometric functions in Exercises 1 to 5.

1. \cos x = – \frac{1}{2}, x lies in the third quadrant

2. \sin x =  \frac{3}{5}, x lies in the second quadrant

3. \cot x =  \frac{3}{4}, x lies in the third quadrant

4. \sec x =  \frac{13}{5}, x lies in the fourth quadrant

5. \tan x = – \frac{5}{12}, x lies in the second quadrant

Relationship between trigonometric ratios of positive and negative angles

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