Trigonometric Ratios and Identities
This topic of Trigonometry is already introduced in Standard X.Recollect
b. given any one Trigonometric ratio, you know how to |
Or
sin and cos are complements of each other
tan and cot are complements of each other
sec and cosec are complements of each other
e. Simple Identities
f. Values of Trigonometric ratios of angles 0, 30Â°, 45Â°, 60Â° and 90Â°.
sin | cos | tan | cosec | sec | cot | |
0Â° | 0 | 1 | 0 | not defined | 1 | not defined |
30Â° | 2 | |||||
45Â° | 1 | 1 | ||||
60Â° | 2 | |||||
90Â° | 1 | 0 | not defined | 1 | not defined | 0 |
You have used all these properties in heights and distance problems involving right angled triangles.