| |
|
|
| |
 |
| Introduction |
 |
| Let us recapitulate the trigonometric ratios (t-ratios). There are six t-ratios. |
| |
| DABC is a right-angled triangle,
ÐB = 90o. |
| |
 |
| |
(i)  |
| |
 |
| |
In short,  |
| |
(ii)  |
| |
In short,  |
| |
(iii) tangent A  |
| |
tangent A In short, tan A  |
| |
| Similarly three more ratios can be obtained by taking the reciprocals of sine, cosine and tangent ratios. |
| |
(iv) cosecant In short,  |
| |
(v) secant In short,  |
| |
(vi) cotangent In short,  |
| |
| From the above figure, we can obtain: |
| |
 |
| |
  |
| |
 |
| |
  |
| |
 |
| |
  |
| |
 |
| |
| sine A means sine of angle A. |
| |
(i) sin A is not sine x A |
| |
(ii) sin A + sin B sin (A + B) |
| |
(iii) sin A + cos A (sin + cos) A |
| |
|
|
| |
|
|
| |
|
|
|
|
|
Get FREE Live Tutoring
(No credit card required)
Customer Care
Click to get customer service, technical support and subscription help.
Refer-A-Friend
Get One Month Free!
When you refer a friend
Trigonometrical Identities
|
|
|